assets: hdpi is preferred, not both mdpi and hdpi

leo.mk

@@ -162,9 +162,10 @@ PRODUCT_PACKAGES += \
 # strict mode
 ADDITIONAL_DEFAULT_PROPERTIES += persist.sys.strictmode.disable=true
 	
-# leo uses high-density artwork where available
-PRODUCT_AAPT_CONFIG := normal hdpi mdpi
-PRODUCT_AAPT_PREF_CONFIG := hdpi mdpi
+# make fallback to mdpi possible
+# e.g. for maintaining crisp assets on 160dpi
+PRODUCT_AAPT_CONFIG := normal mdpi hdpi
+PRODUCT_AAPT_PREF_CONFIG := hdpi
 
 PRODUCT_PROPERTY_OVERRIDES += \
 	debug.sf.hw=1 \