Properly clean `button_add_item` ref in Array/Dict property editors
Properly clean `button_add_item` ref in Array/Dict property editors

Fixes #59152.

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