ViewModeSwitcher: Add missing types

Author: BastianLedererIcinga

src/Control/ViewModeSwitcher.php

@@ -226,7 +226,7 @@ public function setViewMode(string $name): static
     /**
      * Set callback to protect ids with
      *
-     * @param callable $protector
+     * @param callable(string): string $protector
      *
      * @return $this
      */
@@ -237,7 +237,7 @@ public function setIdProtector(callable $protector): static
         return $this;
     }
 
-    private function protectId($id)
+    private function protectId(string $id): string
     {
         if (is_callable($this->protector)) {
             return call_user_func($this->protector, $id);