Speed up install-system progress bar

The progress bar for copy files is nice but slows down the install
because it updates too often

1 files changed, 2 insertions, 1 deletions

diff --git a/scripts/install-system b/scripts/install-system
index adda7339..17adb98c 100755
--- a/scripts/install-system
+++ b/scripts/install-system
@@ -899,7 +899,7 @@ create_partitions() {
 copy_filesystem() {
     cp -r -v --preserve=all "$@" | awk '{
 	++files
-	if ((files % 10) == 0) {
+	if ((files % 100) == 0) {
 	    percent = files / total_files * 100
 	    printf "%3d%% [", percent
             for (i=0;i<percent; i+=2)
@@ -908,6 +908,7 @@ copy_filesystem() {
 	    for (;i<100;i+=2)
                 printf " "
             printf "]\r"
+	    fflush()
 	}
      }' total_files=$(find "$@" | wc -l)
 }