Ticket #3586: mcedit - fix "Lower case selection" command in User Menu

Fix bug #3586 reported by rimf (plus minor tweak remove unneeded
cat/pipe command)

Signed-off-by: Andreas Mohr <and@gmx.li>
Signed-off-by: Yury V. Zaytsev <yury@shurup.com>

misc/mcedit.menu.in

@@ -471,13 +471,13 @@ o       Open bash to next free console
 u       Upper case selection
         TMPFILE=`mktemp ${MC_TMPDIR:-/tmp}/up.XXXXXX` || exit 1
         cat %b > $TMPFILE
-        cat $TMPFILE| sed 's/\(.*\)/\U\1/' >%b
+        sed 's/\(.*\)/\U\1/' $TMPFILE >%b
         rm -f $TMPFILE
 
 l       Lower case selection
         TMPFILE=`mktemp ${MC_TMPDIR:-/tmp}/up.XXXXXX` || exit 1
         cat %b > $TMPFILE
-        cat $TMPFILE| sed 's/\(.*\)/\U\1/' >%b
+        sed 's/\(.*\)/\L\1/' $TMPFILE >%b
         rm -f $TMPFILE
 
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