[Android] Retain the application name with space on device.

This patch is to retain the application name with space.
Get the original name, transfer it to customize.py, rewrite the
label value in AndroidManifest.xml with original name.

BUG=XWALK-1860
"fun" is a very weird variable name, and since its value is always the same you should just call `self.assertTrue` directly in `VerifyResultForAppNameWithSpace` (which could then become a method of `TestMakeApk`).