Bugfixings for Cache-Lock

- used wrong cachekey in set
- therefore added an abstraction to avoid wrong key concatenation
- forgot to increase the db-version to 1275

src/Core/Cache/ArrayCache.php

@@ -12,7 +12,7 @@ use Friendica\Core\Cache;
  *
  * @package Friendica\Core\Cache
  */
-class ArrayCache implements IMemoryCacheDriver
+class ArrayCache extends AbstractCacheDriver
 {
 	use TraitCompareDelete;