Fix StandardRB linting issues (#496)

- Auto-corrected Ruby style issues
- Applied standardrb --fix-unsafely

[Automated daily update]

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: stefan-burke

app/config/units_config.rb

@@ -38,7 +38,7 @@ def self.parse_unit_types(value)
   def available_unit_types
     all_types = Unit.unit_types.keys
     return all_types if enabled_unit_types.empty?
-    all_types.select { enabled_unit_types.include?(_1) }
+    all_types.select { enabled_unit_types.include?(it) }
   end
 
   sig { returns(T::Boolean) }