Fix loading of blend mode and draw target of horizontal gradients + a… #838

Job	Run time
clickable (Debug, amd64, glew)	26m 6s
clickable (Debug, amd64, sdl)	18m 52s
clickable (Debug, armhf, glew)	16m 4s
clickable (Debug, armhf, sdl)	15m 3s
clickable (Release, amd64, glew)	19m 23s
clickable (Release, amd64, sdl)	15m 58s
clickable (Release, arm64, glew)	16m 5s
clickable (Release, arm64, sdl)	15m 59s
clickable (Release, armhf, glew)	14m 45s
clickable (Release, armhf, sdl)	19m 44s
	2h 57m 59s

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