Fixed premature exit when autoremove detected

It was found that on `autoremove` detection, the program output would be
stopped. Now the flag will be set, but program output will continue to
be printed.

aptgrade.go

@@ -42,7 +42,6 @@ func run_command(command []string) (bool, error) {
 				fmt.Print(text)
 				if strings.Contains(text, "autoremove") {
 					do_autoremove = true
-					return
 				}
 			}
 		}