Remove redundant path check

The first `if` statement in this method already performs this same
check, so the expression here always evaluated to `true`.

Author: colinodell

Request.php

@@ -1120,7 +1120,7 @@ public function getRelativeUriForPath($path)
         }
 
         $sourceDirs = explode('/', isset($basePath[0]) && '/' === $basePath[0] ? substr($basePath, 1) : $basePath);
-        $targetDirs = explode('/', isset($path[0]) && '/' === $path[0] ? substr($path, 1) : $path);
+        $targetDirs = explode('/', substr($path, 1));
         array_pop($sourceDirs);
         $targetFile = array_pop($targetDirs);