base-files: fix argument order to date in sysfixtime so that it also works with musl

Seems like the reverse order relies on GNU specific getopt hackery which
musl does not replicate

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 41045

package/base-files/files/etc/init.d/sysfixtime

@@ -5,7 +5,7 @@ START=00
 
 boot() {
 	local curtime="$(date +%s)"
-	local maxtime="$(find /etc -type f -exec date +%s -r {} \; | sort -nr | head -n1)"
+	local maxtime="$(find /etc -type f -exec date -r {} +%s \; | sort -nr | head -n1)"
 	[ $curtime -lt $maxtime ] && date -s @$maxtime
 }