Remove duplicate code

Author: furtib

src/codechecker_config.bzl

@@ -35,14 +35,9 @@ def get_config_file(ctx):
 
     # Create CodeChecker JSON config file and env vars
     if ctx.attr.config:
-        if type(ctx.attr.config) == "list":
-            config_info = ctx.attr.config[0][CodeCheckerConfigInfo]
-        else:
-            config_info = ctx.attr.config[CodeCheckerConfigInfo]
         if config_info.config_file:
             # Create a copy of CodeChecker configuration file
             # provided via codechecker_config(config_file)
-            config_file = config_info.config_file.files.to_list()[0]
             ctx.actions.run(
                 inputs = [config_file],
                 outputs = [ctx_config_file],