Use IsProd instead of testing if it's equal. (#14336)

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: zeripath <art27@cantab.net>

routers/init.go

@@ -50,7 +50,7 @@ func checkRunMode() {
 	default:
 		macaron.Env = macaron.PROD
 		macaron.ColorLog = false
-		setting.ProdMode = true
+		git.Debug = false
 	}
 	log.Info("Run Mode: %s", strings.Title(macaron.Env))
 }