Override getLanguage for BuildCodeStyleSettingsProvider (#7927)

addresses plugin warning from CodeStyleSettingsProvider.getConfigurableId

Author: ujohnny

base/src/com/google/idea/blaze/base/lang/buildfile/formatting/BuildCodeStyleSettingsProvider.java

@@ -20,6 +20,7 @@
 import com.intellij.application.options.CodeStyleAbstractConfigurable;
 import com.intellij.application.options.CodeStyleAbstractPanel;
 import com.intellij.application.options.TabbedLanguageCodeStylePanel;
+import com.intellij.lang.Language;
 import com.intellij.psi.codeStyle.CodeStyleConfigurable;
 import com.intellij.psi.codeStyle.CodeStyleSettings;
 import com.intellij.psi.codeStyle.CodeStyleSettingsProvider;
@@ -29,6 +30,11 @@
 /** Separate configurable code-style settings for BUILD language. */
 public class BuildCodeStyleSettingsProvider extends CodeStyleSettingsProvider {
 
+  @Override
+  public @Nullable Language getLanguage() {
+    return BuildFileLanguage.INSTANCE;
+  }
+
   @Override
   public CodeStyleConfigurable createConfigurable(
       CodeStyleSettings settings, CodeStyleSettings originalSettings) {