Remove PHPCS exclusion and fix it

Again, we're left with only one exclusion that I don't know how to fix.
See phab for a longer explanation.

Bug: T178007
Change-Id: I017097abef755bc65c77a5658ad92320bc42d78b

.phpcs.xml

@@ -2,7 +2,6 @@
 <ruleset>
 	<rule ref="./vendor/mediawiki/mediawiki-codesniffer/MediaWiki">
 		<exclude name="MediaWiki.Commenting.FunctionAnnotations.UnrecognizedAnnotation" />
-		<exclude name="Squiz.PHP.NonExecutableCode.Unreachable" />
 	</rule>
 	<rule ref="Generic.Files.LineLength">
 		<exclude-pattern>AbuseFilter\.alias\.php</exclude-pattern>

includes/pagers/AbuseFilterPager.php

@@ -254,7 +254,6 @@ class AbuseFilterPager extends TablePager {
 				)->parse();
 			case 'af_group':
 				return AbuseFilter::nameGroup( $value );
-				break;
 			default:
 				throw new MWException( "Unknown row type $name!" );
 		}

includes/pagers/GlobalAbuseFilterPager.php

@@ -74,7 +74,6 @@ class GlobalAbuseFilterPager extends AbuseFilterPager {
 			case 'af_group':
 				// If this is global, local name probably doesn't exist, but try
 				return AbuseFilter::nameGroup( $value );
-				break;
 			default:
 				throw new MWException( "Unknown row type $name!" );
 		}