Add option to uninstall TWRP app from /system

Change-Id: Ibe372a372333c357810be2afcb3796723ca370cb
diff --git a/data.cpp b/data.cpp
index cd03d78..088dbda 100755
--- a/data.cpp
+++ b/data.cpp
@@ -909,11 +909,13 @@
 #ifdef TW_OEM_BUILD
 	LOGINFO("TW_OEM_BUILD := true\n");
 	mConst.SetValue("tw_oem_build", "1");
+	mConst.SetValue("tw_app_installed_in_system", "0");
 #else
 	mConst.SetValue("tw_oem_build", "0");
 	mPersist.SetValue("tw_app_prompt", "1");
 	mPersist.SetValue("tw_app_install_system", "1");
 	mData.SetValue("tw_app_install_status", "0"); // 0 = no status, 1 = not installed, 2 = already installed
+	mData.SetValue("tw_app_installed_in_system", "0");
 #endif
 
 	mData.SetValue("tw_enable_adb_backup", "0");