Don't quit ncdu when pressing 'q' while the info window is shown

Just hide the info window in that case.

src/browser.c

@@ -426,7 +426,11 @@ int browse_key(int ch) {
 
     /* and other stuff */
     case 'q':
+      if(flags & BF_INFO)
+        nonfo++;
+      else
         return 1;
+      break;
     case 'g':
       if(++graph > 3)
         graph = 0;