Trigger formatting check workflow on changes to formatter configuration

For the sake of efficiency, the repository's GitHub Actions workflows are configured to only run when relevant files are
modified.

The formatter configuration file is one such file, yet was previously omitted from the paths filter.

Author: per1234

.github/workflows/code-formatting-check.yml

@@ -4,11 +4,13 @@ on:
   pull_request:
     paths:
       - ".github/workflows/code-formatting-check.yml"
+      - "examples_formatter.conf"
       - "examples_formatter.sh"
       - "examples/**"
   push:
     paths:
       - ".github/workflows/code-formatting-check.yml"
+      - "examples_formatter.conf"
       - "examples_formatter.sh"
       - "examples/**"