Fix DeprecationWarning: Removed Gdk.threads_enter/leave calls

[dk8877]

Removes the deprecated Gdk.threads_enter() and Gdk.threads_leave() calls.
Modern Gdk handles thread locking automatically, so these manual locks are no longer needed and cause DeprecationWarnings.

Tested locally on Fedora; the application launches correctly and the specific DeprecationWarning is gone.

Closes #126

[zdohnal]

Hi @dk8877 ,

thank you for the PR! I see you commented out the threads methods - can you remove them if they are not needed?

[dk8877]

ohk i will do it soon

[dk8877]

Done! I have removed the ines @zdohnal

[zdohnal]

There were some issues with indentation and some lines are not needed anymore, would you mind looking into it?

[dk8877]

@zdohnal Thanks for the review! I have addressed all the points:
newprinter.py: Removed the finally: block and fixed the indentation of opreq_id_search_error.
authconn.py: Removed the if self._lock: checks and fixed the indentation for the try/except block.
asyncpk1.py: Removed the unnecessary pass statements and moved the debug lines inside the if scope.

[zdohnal]

There are some unnecessary changes in indentation and one try: block was removed incorrectly (we catch exception there, try: will stay) - please look into it.

Thank you in advance!

[dk8877]

@zdohnal Thanks for the review! I have fixed the issues. You can review it now.