gui: fix DEVICE_RESOLUTION warnings in Android.mk

Indenting the warnings with tab resulted in a make error
"*** commands commence before first target.  Stop."
instead of the intended message. Using spaces instead.

Also fixed the web link to point to the current build guide on XDA
instead of the outdated one on rootzwiki.

Change-Id: I8b25d39edae16dbc479c0e36bd11e12b49b4fbb0
diff --git a/gui/Android.mk b/gui/Android.mk
index d7a605e..8ea4f3b 100644
--- a/gui/Android.mk
+++ b/gui/Android.mk
@@ -64,21 +64,21 @@
 endif
 
 ifeq ($(DEVICE_RESOLUTION),)
-$(warning ********************************************************************************)
-$(warning * DEVICE_RESOLUTION is NOT SET in BoardConfig.mk )
-$(warning * Please see http://tinyw.in/nP7d for details    )
-$(warning ********************************************************************************)
-$(error stopping)
+  $(warning ********************************************************************************)
+  $(warning * DEVICE_RESOLUTION is NOT SET in BoardConfig.mk )
+  $(warning * Please see http://tinyw.in/50tg for details.   )
+  $(warning ********************************************************************************)
+  $(error stopping)
 endif
 
 ifeq ($(TW_CUSTOM_THEME),)
-	ifeq "$(wildcard $(commands_recovery_local_path)/gui/devices/$(DEVICE_RESOLUTION))" ""
-	$(warning ********************************************************************************)
-	$(warning * DEVICE_RESOLUTION ($(DEVICE_RESOLUTION)) does NOT EXIST in $(commands_recovery_local_path)/gui/devices )
-	$(warning * Please choose an existing theme or create a new one for your device )
-	$(warning ********************************************************************************)
-	$(error stopping)
-	endif
+  ifeq "$(wildcard $(commands_recovery_local_path)/gui/devices/$(DEVICE_RESOLUTION))" ""
+    $(warning ********************************************************************************)
+    $(warning * DEVICE_RESOLUTION ($(DEVICE_RESOLUTION)) does NOT EXIST in $(commands_recovery_local_path)/gui/devices )
+    $(warning * Please choose an existing theme or create a new one for your device. )
+    $(warning ********************************************************************************)
+    $(error stopping)
+  endif
 endif
 
 LOCAL_C_INCLUDES += bionic external/stlport/stlport $(commands_recovery_local_path)/gui/devices/$(DEVICE_RESOLUTION)