fixed rendering of indexed frames with palette (#55) #295

Job	Run time
Detect version	7s
Build libdmdutil-win-x64	3m 24s
Build libdmdutil-win-x86	4m 30s
Build libdmdutil-macos-arm64	1m 0s
Build libdmdutil-macos-x64	1m 22s
Build libdmdutil-linux-x64	1m 1s
Build libdmdutil-linux-aarch64	9m 22s
Build libdmdutil-android-arm64-v8a	47s
Build libdmdutil-ios-arm64	33s
Build libdmdutil-ios-simulator-arm64	49s
Build libdmdutil-tvos-arm64	48s
Build libdmdutil-macos	11s
	23m 54s

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