fix: incorrect arg skip pattern for --check_out_path=

[tomlau10]

(first thing first, this bug is NOT introduced by recent changes)

Problem

With #3051, now the default check output format is pretty.
But I also want to parse the check.json, so I added --check_out_path=xxx option is my team's project CI:

${LUALS_PATH}/bin/lua-language-server --check=. --check_out_path=${LUALS_RESULT_FILE} --num_threads=2 --checklevel=Error

• But after adding the --check_out_path=, I then found that --num_threads=2 seems not working 😳
• However if I add --check_out_path= at the end, it will work 🙄

  # this works ${LUALS_PATH}/bin/lua-language-server --check=. --num_threads=2 --checklevel=Error --check_out_path=${LUALS_RESULT_FILE}

Investigation

Upon investigation, I found that the --num_threads argument is not passed to check workers if it is placed just after a --check_out_path=.
With further debugging, it is due to the incorrect skip pattern for --check_out_path=:

lua-language-server/script/cli/check.lua

Lines 23 to 24 in b0b5c8f

	elseif arg:lower():match('%-%-check_out_path') and numThreads > 1 then
	if not arg:match('%-%-%w*=') then

• %w only matches alphanumeric characters
• but check_out_path contains underscore _
• => it needs to be [%w_] for it to work