Fix build of GDMonoField
Fix build of GDMonoField

Closes #15385.

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