- Fix SwitchExpressionsFixCore SwitchStatementsFinder to ignore
  switches where assignments are not simple field or local variable
  accesses
- add new test to CleanUpTest14

Change-Id: I8102b3c74d4a4cc901b3d8d30d00a633e8cb7d90
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.ui/+/190032
Tested-by: JDT Bot <jdt-bot@eclipse.org>
Tested-by: Jeff Johnston <jjohnstn@redhat.com>
Reviewed-by: Jeff Johnston <jjohnstn@redhat.com>