Revert "Remove alpha from hexadecimal colors"

This reverts commit 79ec81dc5cebe310ef091ebd7c1e56ac8fef4a93.

Author: vmcj

webapp/src/Utils/Utils.php

@@ -352,12 +352,6 @@ public static function convertToColor(string $hex): ?string
      */
     public static function parseHexColor(string $hex): array
     {
-        // Ignore alpha in hexstrings
-        if (strlen($hex) === 5) {
-            $hex = substr($hex, 0, 4);
-        } else if (strlen($hex) === 9) {
-            $hex = substr($hex, 0, 7);
-        }
         // Source: https://stackoverflow.com/a/21966100
         $length = (strlen($hex) - 1) / 3;
         $fact = [17, 1, 0.062272][$length - 1];