Correct cc_test_library migration

Previously we were treating it as a shared library only, but
cc_test_library produces both a static and shared library.

Test: bp2build tests
Change-Id: I293d4246d581212b95765fa8f084301514d00dbf
diff --git a/cc/cc.go b/cc/cc.go
index 9c555a1..246444f 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -3914,8 +3914,8 @@
 		// TODO(b/244431896) properly convert cc_test_library to its own macro. This
 		// will let them add implicit compile deps on gtest, for example.
 		//
-		// For now, treat them as regular shared libraries.
-		return sharedLibrary
+		// For now, treat them as regular libraries.
+		return fullLibrary
 	} else if c.CcLibrary() {
 		static := false
 		shared := false