[BUGFIX] Avoid undefined array key 'casesensitiveComp'
Using null coalescing operator with fallback to 'false' to avoid undefined array key access warnings when key 'casesensitiveComp' is not set. Using 'false' here as this matches the behaviour of <PHP8.0, and as this is used as method argument of type bool a bool typecase is added along the way to be on the safe side. Resolves: #96537 Releases: main, 11.5 Change-Id: I3c4df09b2adf5eec57e31947189f4a1e2aea4bd2