fix presence channel

[nenads]

Hi love what have you done so far.

There is issue with presence channel:

1. Auth route returns extra data:

{"auth":"2edb16a0a48b7cb9","channel_data":"{\"user_id\":1,\"user_info\":{\"id\":1,\"name\":\"admin\"}}"}

Channel data needs to be send over Web-Socket to correspond with auth token for that channel.

2. Backed was json encoding string so auth would fail, since request parameter was never converted to array in first place.

[codecov]

Codecov Report

Merging #15 (72efe49) into master (957ce4f) will not change coverage.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master      #15   +/-   ##
=========================================
  Coverage     43.31%   43.31%           
  Complexity       53       53           
=========================================
  Files             9        9           
  Lines           344      344           
  Branches         14       14           
=========================================
  Hits            149      149           
  Misses          187      187           
  Partials          8        8           

Flag	Coverage Δ
jest	54.47% <ø> (ø)
pest-8.0	37.10% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
js-src/Websocket.ts	61.42% <ø> (ø)
src/Handler.php	63.76% <0.00%> (ø)

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[georgeboot]

Thank you for your contribution!