fix #3729: compass deviation -90° in landscape mode
fix #3729: compass deviation -90° in landscape mode

xiaoyanit/cgeo,matej116/cgeo,yummy222/cgeo,KublaikhanGeek/cgeo,matej116/cgeo,samueltardieu/cgeo,mucek4/cgeo,samueltardieu/cgeo,cgeo/cgeo,Bananeweizen/cgeo,brok85/cgeo,schwabe/cgeo,cgeo/cgeo,S-Bartfast/cgeo,schwabe/cgeo,vishwakulkarni/cgeo,yummy222/cgeo,ThibaultR/cgeo,lewurm/cgeo,auricgoldfinger/cgeo,lewurm/cgeo,auricgoldfinger/cgeo,ThibaultR/cgeo,lewurm/cgeo,yummy222/cgeo,superspindel/cgeo,Huertix/cgeo,marco-dev/c-geo-opensource,Bananeweizen/cgeo,auricgoldfinger/cgeo,vishwakulkarni/cgeo,schwabe/cgeo,ThibaultR/cgeo,schwabe/cgeo,Huertix/cgeo,kumy/cgeo,kumy/cgeo,kumy/cgeo,KublaikhanGeek/cgeo,xiaoyanit/cgeo,superspindel/cgeo,matej116/cgeo,rsudev/c-geo-opensource,S-Bartfast/cgeo,marco-dev/c-geo-opensource,brok85/cgeo,pstorch/cgeo,mucek4/cgeo,S-Bartfast/cgeo,tobiasge/cgeo,brok85/cgeo,cgeo/cgeo,rsudev/c-geo-opensource,SammysHP/cgeo,superspindel/cgeo,madankb/cgeo,rsudev/c-geo-opensource,tobiasge/cgeo,marco-dev/c-geo-opensource,madankb/cgeo,Huertix/cgeo,madankb/cgeo,KublaikhanGeek/cgeo,mucek4/cgeo,pstorch/cgeo,SammysHP/cgeo,xiaoyanit/cgeo,vishwakulkarni/cgeo,cgeo/cgeo,tobiasge/cgeo,pstorch/cgeo,Bananeweizen/cgeo,samueltardieu/cgeo,SammysHP/cgeo