pager: default to LESS=FRS

Recent change to paginate "git diff" by default is often irritating
when you do not have any change (or very small change) in your working
tree.

Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/pager.c b/pager.c
index dcb398d..8bd33a1 100644
--- a/pager.c
+++ b/pager.c
@@ -50,7 +50,7 @@
 	close(fd[0]);
 	close(fd[1]);
 
-	setenv("LESS", "-RS", 0);
+	setenv("LESS", "FRS", 0);
 	run_pager(pager);
 	die("unable to execute pager '%s'", pager);
 	exit(255);