Fix handling of pixel ratio for raster image decorator #7700

Job	Run time
build (arm64-android, android_arm64_v8a, OFF, android-arm64)	9m 32s
build (arm64-android, android_arm64_v8a, ON, android-arm64)	9m 3s
build (arm-neon-android, android_armv7, OFF, android-arm-neon)	12m 4s
build (arm-neon-android, android_armv7, ON, android-arm-neon)	7m 35s
build (x64-android, android_x86_64, OFF, android-x64)	10m 52s
build (x64-android, android_x86_64, ON, android-x64)	12m 19s
build (x86-android, android_x86, OFF, android-x86)	8m 39s
build (x86-android, android_x86, ON, android-x86)	7m 54s
comment (commit)	6s
deploy to play store	1m 13s
comment (pr)	0s
	1h 19m 17s

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