OpenDingux Beta: "Core settings" menu crash fix

This maintenance release fixes a nasty bug in the Core settings menu. This was being drawn at the wrong Y offset, such that the last entry (Restore defaults) was positioned off-screen - and as a result, an overflow of the screen buffer was occurring. While the issue was mostly hidden when using OpenDingux stock firmwares, OpenDingux Beta has more robust memory management - and the screen buffer overflow would generate a segfault (crash) when accessing the Core settings menu...

Now the Core settings menu is positioned correctly. The Restore defaults entry is accessible, and crashes on OpenDingux Beta no longer occur.