[Scrub.c] improve responsiveness of progressbar during scrub

Formerly would update progress bar every 100 splits. With scrub being
slow, it's nicer to update every 10 splits. Also remove
the (percentagefunc)(NULL, 0.0) which seems an error -- it would reset
the progressbar back to zero immediately.

libgnucash/engine/Scrub.c

@@ -137,7 +137,7 @@ xaccAccountScrubOrphans (Account *acc, QofPercentageFunc percentagefunc)
     for (node = splits; node; node = node->next)
     {
         Split *split = node->data;
-        if (current_split % 100 == 0)
+        if (current_split % 10 == 0)
         {
             char *progress_msg = g_strdup_printf (message, str, current_split, total_splits);
             (percentagefunc)(progress_msg, (100 * current_split) / total_splits);
@@ -347,7 +347,7 @@ xaccAccountScrubImbalance (Account *acc, QofPercentageFunc percentagefunc)
         PINFO("Start processing split %d of %d",
               curr_split_no + 1, split_count);
 
-        if (curr_split_no % 100 == 0)
+        if (curr_split_no % 10 == 0)
         {
             char *progress_msg = g_strdup_printf (message, str, curr_split_no, split_count);
             (percentagefunc)(progress_msg, (100 * curr_split_no) / split_count);
@@ -356,7 +356,6 @@ xaccAccountScrubImbalance (Account *acc, QofPercentageFunc percentagefunc)
 
         TransScrubOrphansFast (xaccSplitGetParent (split),
                                gnc_account_get_root (acc));
-        (percentagefunc)(NULL, 0.0);
 
         xaccTransScrubCurrency(trans);