Replace use of deprecated User::isBlockedFromEmailuser()

Change-Id: Ic03e63d4585416fa60f602b3d42faaafe8559118

includes/SpecialContact.php

@@ -157,17 +157,16 @@ class SpecialContact extends UnlistedSpecialPage {
 		}
 
 		// Blocked users cannot use the contact form if they're disabled from sending email.
-		if ( $user->isBlockedFromEmailuser() ) {
+		$block = $user->getBlock();
+		if ( $block && $block->appliesToRight( 'sendemail' ) ) {
 			$useCustomBlockMessage = $config['UseCustomBlockMessage'] ?? false;
 			if ( $useCustomBlockMessage ) {
 				$this->getOutput()->showErrorPage( $this->getFormSpecificMessageKey( 'contactpage-title' ),
 					$this->getFormSpecificMessageKey( 'contactpage-blocked-message' ) );
 				return;
-			} else {
-				// If the user is blocked from emailing users then there is a block
-				// @phan-suppress-next-line PhanTypeMismatchArgumentNullable
-				throw new UserBlockedError( $this->getUser()->getBlock() );
 			}
+
+			throw new UserBlockedError( $block );
 		}
 
 		$this->getOutput()->setPageTitleMsg(