fix: remove dead code

Since I was able to return earlier in `filterPath()`, I was able to remove a number of dead conditionals.

Signed-off-by: Matthew Weier O'Phinney <[email protected]>

src/Uri.php

@@ -573,19 +573,6 @@ private function filterPath(string $path): string
             [$this, 'urlEncodeChar'],
             $path
         );
-
-        if ('' === $path) {
-            // No path
-            return $path;
-        }
-
-        if ($path[0] !== '/') {
-            // Relative path
-            return $path;
-        }
-
-        // Ensure only one leading slash, to prevent XSS attempts.
-        return '/' . ltrim($path, '/');
     }
 
     /**