[Spa] Update gradle project setup

Could not use module name :Spa:spa, which would cause Android Studio
cannot find the correct module to run unit test in Spa project.

Change from :Spa:spa to :Spa, this issue will gone.

Bug: 373245944
Flag: EXEMPT gradle only
Test: run BrowseActivityTest
Change-Id: I2decf19f0e40ca12d99c023a4f1ecab1e537ceb2