fix: DNSServer Lib - improper startup code in WiFi mode

[vortigont]

When running on WiFi-AP mode server's start() method returned true while in fact UDP listening socket was never created
Regression introduced in #8760
Closes #10330

[github-actions]

	Warnings
⚠️	Some issues found for the commit messages in this PR: the commit message "DNSServer: fix improper startup code in WiFi mode": body's lines must not be longer than 100 characters footer must have leading blank line type/action should start with a lowercase letter type/action should be one of [change, ci, docs, feat, fix, refactor, remove, revert, test] Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).
⚠️	The source branch "DNSSRV_fix" incorrect format: contains uppercase letters. This can cause troubles on case-insensitive file systems (macOS). Please rename your branch.

👋 Hello vortigont, we appreciate your contribution to this project!

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Generated by 🚫 dangerJS against a7c21df

[github-actions]

Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

Memory	FLASH [bytes]		FLASH [%]		RAM [bytes]		RAM [%]
Target	DEC	INC	DEC	INC	DEC	INC	DEC	INC
ESP32S3	0	⚠️ +88	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32S2	0	⚠️ +96	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32C3	0	⚠️ +108	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32C6	0	⚠️ +108	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32	0	⚠️ +92	0.00	⚠️ +0.01	0	0	0.00	0.00

Click to expand the detailed deltas report [usage change in BYTES]

Target	ESP32S3		ESP32S2		ESP32C3		ESP32C6		ESP32
Example	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM
DNSServer/examples/CaptivePortal	⚠️ +88	0	⚠️ +96	0	⚠️ +108	0	⚠️ +108	0	⚠️ +92	0

[github-actions]

Test Results

 56 files   - 83   56 suites   - 83   4m 26s ⏱️ - 32m 23s
 21 tests  - 13   21 ✅ ± 0  0 💤 ±0  0 ❌ ±0 
135 runs   - 98  135 ✅  - 35  0 💤 ±0  0 ❌ ±0 

Results for commit a7c21df. ± Comparison against base commit 7018cd1.

This pull request removes 13 tests.

performance.coremark.test_coremark ‑ test_coremark
performance.fibonacci.test_fibonacci ‑ test_fibonacci
performance.psramspeed.test_psramspeed ‑ test_psramspeed
performance.ramspeed.test_ramspeed ‑ test_ramspeed
performance.superpi.test_superpi ‑ test_superpi
test_touch_errors
test_touch_interrtupt
test_touch_read
validation.periman.test_periman ‑ test_periman
validation.timer.test_timer ‑ test_timer
…

♻️ This comment has been updated with latest results.

[me-no-dev]

Thanks @vortigont for the fix!