Do not exclude paths in the global level of Code Climate

We use only RuboCop in Code Climate and exclude paths are specified in
RuboCop's setting.

The global level excludes paths should not be specified to match the
behavior of local and CodeClimate.

Author: y-yagi

.codeclimate.yml

@@ -28,9 +28,3 @@ engines:
 ratings:
   paths:
   - "**.rb"
-
-exclude_paths:
-  - ci/
-  - guides/
-  - tasks/
-  - tools/