SCons: Fix MBEDTLS_CONFIG_FILE string escape
SCons: Fix MBEDTLS_CONFIG_FILE string escape

Fixes #30431, regression from #30277.

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