Rename runPythonTestCase

To runBp2BuildTestCaseSimple because it's not Python-specific
but rather Bp2Build-specific

Name is suboptimal but given current functionality and use
we couldn't come up with a better one.

Test: Existing tests pass
Change-Id: I641cd051af741836b21ec6a7d6639516fb13028f
diff --git a/bp2build/testing.go b/bp2build/testing.go
index d8e572d..376bf49 100644
--- a/bp2build/testing.go
+++ b/bp2build/testing.go
@@ -28,7 +28,7 @@
 	return false
 }
 
-func runPythonTestCase(t *testing.T, tc bp2buildTestCase) {
+func runBp2BuildTestCaseSimple(t *testing.T, tc bp2buildTestCase) {
 	t.Helper()
 	runBp2BuildTestCase(t, func(ctx android.RegistrationContext) {}, tc)
 }