* test/: Use lexical-binding the few remaining files

* test/: Use lexical-binding the few remaining files

* test/manual/biditest.el: Use lexical-binding.
(biditest-generate-testfile): Remove unused var `levels`.

* test/manual/image-circular-tests.el: Use lexical-binding.

* test/manual/image-size-tests.el: Use lexical-binding.
(image-size-tests): Check `fboundp` before calling `imagemagick-types`.

* test/manual/redisplay-testsuite.el: Use lexical-binding.

* test/manual/cedet/cedet-utests.el: Use lexical-binding.
Use `with-current-buffer`.
(cedet-utest): Test `fboundp` i.s.o `featurep` to silence warning.
(srecode-map-save-file): Declare var.
(pulse-test): Test `fboundp` before calling `pulse-available-p`.
Declare `pulse-momentary-highlight-overlay` since it's not autoloaded.

* test/manual/cedet/semantic-tests.el: Use lexical-binding.
Use `with-current-buffer`.
(semanticdb-ebrowse-dump): Remove unused var `ab`.
(semanticdb-test-gnu-global): Don't use obsolete "name" arg to constructor.
(cedet-utest-directory): Declare var.