Remove a dangerous exception swallowing

Apparently such a try/catch has never been safe, as we do not know
what operations will be skipped after the SecurityException with
message

  "Permission Denial: not allowed to send broadcast"

is thrown.

Bug: 352615651
Test: FrameworksInputMethodSystemServerTests
Flag: TEST_ONLY
Change-Id: I97458944dd1227331f89d6ca8e0da541cf23e74b