Revert "Turn gtest isolated true by default"

This reverts commit d2a9d88410d5c03a95bf79c09bbed7c106cb53ba.

Reason for revert: DroidMonitor-triggered revert due to breakage https://android-build.googleplex.com/builds/quarterdeck?branch=git_master&target=aosp_bramble-userdebug&lkgb=8618360&lkbb=8620137&fkbb=8618374, bug b/233280626

Bug: 233280626
Change-Id: If56b36ea1c883415b90bd2153707cb69df29776e
diff --git a/cc/test.go b/cc/test.go
index 2aadb85..5703571 100644
--- a/cc/test.go
+++ b/cc/test.go
@@ -259,7 +259,7 @@
 
 func (test *testDecorator) isolated(ctx BaseModuleContext) bool {
 	if !ctx.Windows() {
-		return BoolDefault(test.LinkerProperties.Isolated, true)
+		return BoolDefault(test.LinkerProperties.Isolated, false)
 	}
 	return BoolDefault(test.LinkerProperties.Isolated, false)
 }