notmuch setup: Print a few protecting spaces after progress reports.

This is to help keep the report looking clean when a new report
is shorter than a previous reports, (say, when crossing the
boundary from over one minute remaining to less than one minute
remaining).

This used to be here, but I must have accidentally dropped it
when reformatting the progress report recently.

notmuch.c

@@ -99,7 +99,7 @@ add_files_print_progress (add_files_state_t *state)
 	    state->count, state->total_messages);
     print_formatted_seconds ((state->total_messages - state->count) /
 			     rate_overall);
-    printf (" remaining).\r");
+    printf (" remaining).      \r");
 
     fflush (stdout);
 }