fix: use empty separator for joining snippet description

Author: Saghen

lua/blink/cmp/sources/snippets/utils.lua

@@ -23,9 +23,7 @@ function utils.read_snippet(snippet, fallback)
   local description = snippet.description or fallback
   local body = snippet.body
 
-  if type(description) == "table" then
-    description = vim.fn.join(description)
-  end
+  if type(description) == 'table' then description = vim.fn.join(description, '') end
 
   if type(prefix) == 'table' then
     for _, p in ipairs(prefix) do