Fix android_test install path.

Test: m nothing + diff soong mk and ninja files.
Bug: 140795853
Change-Id: I3667eac951dea7e447cf73219ff89199fca9ed63

android/paths_test.go

@@ -201,6 +201,7 @@ type moduleInstallPathContextImpl struct {
 	baseModuleContext
 
 	inData         bool
+	inTestcases    bool
 	inSanitizerDir bool
 	inRecovery     bool
 }
@@ -219,6 +220,10 @@ func (m moduleInstallPathContextImpl) InstallInData() bool {
 	return m.inData
 }
 
+func (m moduleInstallPathContextImpl) InstallInTestcases() bool {
+	return m.inTestcases
+}
+
 func (m moduleInstallPathContextImpl) InstallInSanitizerDir() bool {
 	return m.inSanitizerDir
 }