remove transparency from back_g.png
remove transparency from back_g.png

Qt4 does not support 8bit transparency as it seems.


Former-commit-id: 5428a5f6ec3c416b3d3407eaa4138be10dfa2b64
muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous