docker: fix entrypoint script

Don't run su in login mode.

entrypoint.sh

@@ -17,8 +17,11 @@ else
 	fi
 fi
 
-if [ $# -ge 1 ]; then
-	exec /system/bin/su - -s /data/data/com.termux/files/usr/bin/env system -- \
+if [ $# -lt 1 ]; then
+	set -- /data/data/com.termux/files/usr/bin/login
+fi
+
+exec /system/bin/su -s /data/data/com.termux/files/usr/bin/env system -- \
 	ANDROID_DATA="$ANDROID_DATA" \
 	ANDROID_ROOT="$ANDROID_ROOT" \
 	HOME="$HOME" \
@@ -28,6 +31,3 @@ if [ $# -ge 1 ]; then
 	TMPDIR="$TMPDIR" \
 	TZ=UTC \
 	"$@"
-else
-	exec /data/data/com.termux/files/usr/bin/login
-fi