[PATCH 5/8] cts: TunerTest: Fix testMaxNumberOfFrontends

In case of error, the max number of FE is not reinstated causing other
tests to fail. Use try block to reset max FE.

Test: atest
Bug: 333379672
(cherry picked from https://android-review.googlesource.com/q/commit:4315470dd68f5449fa67e3a6048ae2bf3f60f123)
Merged-In: I7d181b5ad06615c94ce95314f9c71d22b4e99706
Change-Id: I7d181b5ad06615c94ce95314f9c71d22b4e99706