Vulkan: Fix struct init for VkClearAttachment
Vulkan: Fix struct init for VkClearAttachment

The changes from #38835 were not sufficient to fix #38829, as VkClearAttachment
still had uninitialized member structs in its VkClearColor member struct.

The struct rabbit hole goes deep and trying to do validation as done in #38829
doesn't appear realistic.

Zylann/godot,DmitriySalnikov/godot,Shockblast/godot,Valentactive/godot,ZuBsPaCe/godot,akien-mga/godot,BastiaanOlij/godot,vkbsb/godot,Valentactive/godot,Shockblast/godot,sanikoyes/godot,Valentactive/godot,pkowal1982/godot,godotengine/godot,Faless/godot,pkowal1982/godot,Paulloz/godot,vkbsb/godot,Zylann/godot,vkbsb/godot,firefly2442/godot,godotengine/godot,akien-mga/godot,vkbsb/godot,honix/godot,honix/godot,Faless/godot,Zylann/godot,BastiaanOlij/godot,DmitriySalnikov/godot,godotengine/godot,guilhermefelipecgs/godot,vkbsb/godot,MarianoGnu/godot,Valentactive/godot,Faless/godot,vnen/godot,josempans/godot,Zylann/godot,Shockblast/godot,DmitriySalnikov/godot,honix/godot,vkbsb/godot,guilhermefelipecgs/godot,pkowal1982/godot,Shockblast/godot,MarianoGnu/godot,Shockblast/godot,akien-mga/godot,BastiaanOlij/godot,josempans/godot,MarianoGnu/godot,Zylann/godot,Faless/godot,vnen/godot,ZuBsPaCe/godot,sanikoyes/godot,DmitriySalnikov/godot,Shockblast/godot,josempans/godot,akien-mga/godot,firefly2442/godot,akien-mga/godot,Faless/godot,honix/godot,godotengine/godot,pkowal1982/godot,josempans/godot,MarianoGnu/godot,BastiaanOlij/godot,Paulloz/godot,godotengine/godot,pkowal1982/godot,godotengine/godot,Paulloz/godot,firefly2442/godot,sanikoyes/godot,firefly2442/godot,BastiaanOlij/godot,honix/godot,Paulloz/godot,Shockblast/godot,godotengine/godot,Zylann/godot,akien-mga/godot,akien-mga/godot,DmitriySalnikov/godot,Paulloz/godot,Shockblast/godot,BastiaanOlij/godot,vnen/godot,sanikoyes/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,MarianoGnu/godot,Valentactive/godot,Faless/godot,MarianoGnu/godot,sanikoyes/godot,Valentactive/godot,sanikoyes/godot,ZuBsPaCe/godot,sanikoyes/godot,vnen/godot,MarianoGnu/godot,Paulloz/godot,guilhermefelipecgs/godot,honix/godot,ZuBsPaCe/godot,vkbsb/godot,josempans/godot,akien-mga/godot,pkowal1982/godot,godotengine/godot,firefly2442/godot,MarianoGnu/godot,vnen/godot,Valentactive/godot,josempans/godot,josempans/godot,Zylann/godot,guilhermefelipecgs/godot,ZuBsPaCe/godot,guilhermefelipecgs/godot,firefly2442/godot,pkowal1982/godot,vnen/godot,BastiaanOlij/godot,vkbsb/godot,josempans/godot,DmitriySalnikov/godot,Faless/godot,vnen/godot,vnen/godot,guilhermefelipecgs/godot,firefly2442/godot,firefly2442/godot,Paulloz/godot,sanikoyes/godot,Faless/godot,ZuBsPaCe/godot,Valentactive/godot,ZuBsPaCe/godot,Zylann/godot,pkowal1982/godot,DmitriySalnikov/godot,ZuBsPaCe/godot