Re-enable Xcode 10's new build system

We should no longer see any issues with tests now that the
dependency files are now properly generated.

PiperOrigin-RevId: 233657295
diff --git a/src/TulsiGenerator/XcodeProjectGenerator.swift b/src/TulsiGenerator/XcodeProjectGenerator.swift
index 8be6a37..c2b3b05 100644
--- a/src/TulsiGenerator/XcodeProjectGenerator.swift
+++ b/src/TulsiGenerator/XcodeProjectGenerator.swift
@@ -559,7 +559,6 @@
 
     let workspaceSharedDataURL = projectURL.appendingPathComponent("project.xcworkspace/xcshareddata")
     let sharedWorkspaceSettings: [String: Any] = [
-      "BuildSystemType": "Original",
       "IDEWorkspaceSharedSettings_AutocreateContextsIfNeeded": false as AnyObject,
     ]
     try writeWorkspaceSettings(sharedWorkspaceSettings,