Remove unnecessary backslashes from class names

These are not needed in the current namespace context.

Author: Jazz-Man

src/helper.php

@@ -82,7 +82,7 @@ function app_get_attachment_image_url( int|string $attachmentId, array|string $s
             }
 
             return $image['url'];
-        } catch ( \Exception ) {
+        } catch ( Exception ) {
             return false;
         }
     }
@@ -99,7 +99,7 @@ function app_get_attachment_image( int|string $attachmentId, array|string $size
 
         if ( empty( $image ) ) {
             /** @var string $size */
-            $exception = new \Exception( sprintf( 'Image not fount: attachment_id "%d", size "%s"', $attachmentId, $size ) );
+            $exception = new Exception( sprintf( 'Image not fount: attachment_id "%d", size "%s"', $attachmentId, $size ) );
             app_error_log( $exception, 'app_get_attachment_image' );
 
             return '';
@@ -152,7 +152,7 @@ function app_get_attachment_image( int|string $attachmentId, array|string $size
      */
     function app_attachment_url_to_postid( string $url ): bool|int {
 
-        /** @var \wpdb $wpdb */
+        /** @var wpdb $wpdb */
         global $wpdb;
 
         if ( ! filter_var( $url, FILTER_VALIDATE_URL ) ) {