Enable PhanPluginDuplicateExpressionAssignmentOperation issue

Conflicts between backports before the EOL of 1.35 and
a release of this config enabled as default seems very unlikly.

Change-Id: I10c558b114616eca1097fcb0be52b4bc6b57453a

src/config-library.php

@@ -61,13 +61,7 @@
 		// Would probably have many false positives
 		'PhanPluginMixedKeyNoKey',
 	] )
-	->enableTaintCheck( $DIR, 'vendor/' )
-	->suppressIssueTypes(
-	// PHP 7.4 functionality; suppress by default until we no longer support PHP < 7.4.
-	// In reality, this means when MW 1.35 is EOL, expected September 2023.
-	// This will hopefully prevent some issues with backporting.
-		'PhanPluginDuplicateExpressionAssignmentOperation',
-	);
+	->enableTaintCheck( $DIR, 'vendor/' );
 
 // BC: We're not ready to use the ConfigBuilder everywhere
 return $baseCfg->make();

src/config.php

@@ -111,13 +111,7 @@
 		'wgRequest' => file_exists( "$IP/includes/Request/WebRequest.php" )
 			? '\\MediaWiki\\Request\\WebRequest' : '\\WebRequest',
 	] )
-	->enableTaintCheck( $DIR, $VP )
-	->suppressIssueTypes(
-		// PHP 7.4 functionality; suppress by default until we no longer support PHP < 7.4.
-		// In reality, this means when MW 1.35 is EOL, expected September 2023.
-		// This will hopefully prevent some issues with backporting.
-		'PhanPluginDuplicateExpressionAssignmentOperation',
-	);
+	->enableTaintCheck( $DIR, $VP );
 
 // BC: We're not ready to use the ConfigBuilder everywhere
 return $baseCfg->make();