fixes for fakeflash zips

For some reason fakeflash doesn't like to have superuser/su
in /res, move it to its own subdir in /supersu. This allows
a fakeflash zip built with 'make recoveryzip' to work correctly.

Change-Id: I32e2e0f6dba55281d5c917e931c3ef0034964bcb
diff --git a/recovery.cpp b/recovery.cpp
index 4da176a..4f07fd4 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -981,7 +981,7 @@
 			rename("/system/recovery-from-boot.p", "/system/recovery-from-boot.bak");
 			ui_print("Renamed stock recovery file in /system to prevent\nthe stock ROM from replacing TWRP.\n");
 		}
-		if (TWFunc::Path_Exists("/res/supersu/su") && !TWFunc::Path_Exists("/system/bin/su") && !TWFunc::Path_Exists("/system/xbin/su") && !TWFunc::Path_Exists("/system/bin/.ext/.su")) {
+		if (TWFunc::Path_Exists("/supersu/su") && !TWFunc::Path_Exists("/system/bin/su") && !TWFunc::Path_Exists("/system/xbin/su") && !TWFunc::Path_Exists("/system/bin/.ext/.su")) {
 			// Device doesn't have su installed
 			DataManager_SetIntValue("tw_busy", 1);
 			if (gui_startPage("installsu") != 0) {