javascript/api: Making the build not preprocess the source for coverage when in debug mode.
javascript/api: Making the build not preprocess the source for coverage when in debug mode.

Preprocessor which is used to generate coverage obfuscate the code which makes debugging very
hard. Removing the preprocessors for debug mode all together.

Change-Id: Ia725f7f1988ac6f544c848cfb326bc1a25b3c2d9

vanadium/js,vanadium/js,vanadium/js,vanadium/js