Fix shader compilation fail on Android
Fix shader compilation fail on Android

Error message from logcat

**ERROR**: SceneShaderGLES3: Fragment Program Compilation Failed:
50:471: S0032: no default precision defined for parameter 'probe'
   At: drivers/gles3/shader_gles3.cpp:167:_display_error_with_code() - SceneShaderGLES3: Fragment Program Compilation Failed:

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