LibEDID: Store EDID version instead of allocating on each getter call

This also let's us use a KString instead of a string when we're in the
Kernel, which opens the path for OOM-failure propagation.

Userland/Libraries/LibEDID/VIC.cpp

@@ -4,7 +4,6 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <AK/String.h>
 #include <LibEDID/VIC.h>
 
 namespace EDID {