Fix phone preview

assets/images/Makefile

@@ -114,7 +114,7 @@ phone@1000.png: phone.png
 phone@1220.png: phone.png
 	$(RESOLUTION) phone 1220 85
 phone@thumb.png: phone.png
-	$(THUMB) phone 16x 70 png
+	$(THUMB) phone 16x16 0 none
 tablet@545.png: tablet.png
 	$(RESOLUTION) tablet 545 85
 tablet@640.png: tablet.png

assets/images/generate_makefile.sh

@@ -63,7 +63,7 @@ themes="material_light material_dark solarized_light solarized_dark gruvbox_ligh
 for image in ${themes}; do
   generate_rule ${image} "220 266 335 352 532" 16x ${QUALITY} ${THUMB_QUALITY_JPG} jpg
 done
-generate_rule phone "220 300 400 520 640 800 1000 1220" 16x ${QUALITY} ${THUMB_QUALITY_PNG} png
+generate_rule phone "220 300 400 520 640 800 1000 1220" 16x16 ${QUALITY} 0 none
 generate_rule tablet "545 640 720 800 880 960 1090 1635 2180" 16x16 ${QUALITY} 0 none
 generate_rule notifications "363 474 590" 16x ${QUALITY} ${THUMB_QUALITY_JPG} jpg
 generate_rule desktop "363 474 590 726 948 1180" 16x ${QUALITY} ${THUMB_QUALITY_JPG} jpg