Can't upload or delete an SD card file whose name includes uppercase G

[dc42]

Neither the web interface nor Pronterface can upload or delete an SD card file if the filename sent in the corresponding Mcode includes an uppercase letter G. When attempting to upload such a file, typically the Duet starts printing the file instead. This also affects M550 commands if the machine name contains an uppercase G, and M551 commands if the password contains an uppercase G.

Fixed in dc42 fork as at version 059a-dc42, commit Duet3D/RepRapFirmware@a416c36.