[Net] Fix SceneReplicationConfig setter.
[Net] Fix SceneReplicationConfig setter.

Used by resource loader, it would always add properties as both sync and
spawn, disregarding the actual option value.

Valentactive/godot,guilhermefelipecgs/godot,Zylann/godot,josempans/godot,Shockblast/godot,pkowal1982/godot,vkbsb/godot,godotengine/godot,Shockblast/godot,pkowal1982/godot,ZuBsPaCe/godot,sanikoyes/godot,josempans/godot,godotengine/godot,ZuBsPaCe/godot,godotengine/godot,sanikoyes/godot,josempans/godot,pkowal1982/godot,firefly2442/godot,godotengine/godot,Zylann/godot,sanikoyes/godot,vkbsb/godot,BastiaanOlij/godot,godotengine/godot,ZuBsPaCe/godot,BastiaanOlij/godot,akien-mga/godot,josempans/godot,ZuBsPaCe/godot,Shockblast/godot,sanikoyes/godot,pkowal1982/godot,ZuBsPaCe/godot,BastiaanOlij/godot,josempans/godot,Shockblast/godot,BastiaanOlij/godot,pkowal1982/godot,godotengine/godot,BastiaanOlij/godot,Shockblast/godot,josempans/godot,sanikoyes/godot,Shockblast/godot,vkbsb/godot,Valentactive/godot,godotengine/godot,firefly2442/godot,godotengine/godot,akien-mga/godot,pkowal1982/godot,firefly2442/godot,Valentactive/godot,vkbsb/godot,akien-mga/godot,vkbsb/godot,Zylann/godot,guilhermefelipecgs/godot,akien-mga/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,akien-mga/godot,Shockblast/godot,Zylann/godot,vkbsb/godot,vkbsb/godot,akien-mga/godot,akien-mga/godot,BastiaanOlij/godot,Valentactive/godot,firefly2442/godot,Zylann/godot,sanikoyes/godot,guilhermefelipecgs/godot,Valentactive/godot,firefly2442/godot,guilhermefelipecgs/godot,sanikoyes/godot,akien-mga/godot,guilhermefelipecgs/godot,Valentactive/godot,ZuBsPaCe/godot,Valentactive/godot,firefly2442/godot,guilhermefelipecgs/godot,ZuBsPaCe/godot,Zylann/godot,firefly2442/godot,Zylann/godot,josempans/godot,vkbsb/godot,guilhermefelipecgs/godot,ZuBsPaCe/godot,Valentactive/godot,Shockblast/godot,Zylann/godot,firefly2442/godot,josempans/godot,sanikoyes/godot,pkowal1982/godot,pkowal1982/godot,BastiaanOlij/godot