fix #4079: set mail subject for support mail
fix #4079: set mail subject for support mail

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