scripts/config: Fix wrong "shift" for --keep-case

Remove wrong "shift" for --keep-case. There is always "shift" at
beginning of while-loop. No need "shift" at --keep-case just before
"continue" to process next argument.

Now the following works as expected:

./scripts/config -e aAa -k -e bBb -e cCc && tail -3 .config
CONFIG_AAA=y
CONFIG_bBb=y
CONFIG_cCc=y

Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/scripts/config b/scripts/config
index ee35539..bb4d3de 100755
--- a/scripts/config
+++ b/scripts/config
@@ -101,7 +101,6 @@
 	case "$CMD" in
 	--keep-case|-k)
 		MUNGE_CASE=no
-		shift
 		continue
 		;;
 	--refresh)