[Improve] Remove , from the arg string in command signature.

This commit removes the ending `, ` from the arg dictionary in the
command signature.

Author: UltraInstinct05

src/commands/commands_browser_core_commands.py

@@ -111,7 +111,7 @@ def on_select(self, idx, event, commands_data):
                 arg_name = arg['name']
                 arg_string = arg_string + f'"{arg_name}": , '
 
-            final_string = final_string + f'"{command_data[0]}", ' + "{ " + arg_string + " })"
+            final_string = final_string + f'"{command_data[0]}", ' + "{ " + arg_string.rstrip(", ") + " })"
             sublime.set_clipboard(final_string)
             sublime.status_message("Command signature copied to clipboard.")