DFReader: In dump verbose show hex value for bitmask fields

[shancock884]

The aim of this PR is to add the hex value alongside the decimal value, when displaying bitmask fields with the "dump --verbose" command in MavExplorer, as I think it is easier to follow which bits are set in hex.

This is also more in-line with how bitmasks are shown from TLog files when using "dump --verbose".

For example, on XKF4:

> dump --verbose XKF4
2024-12-04 14:53:37.722: XKF4
    ...
    SS: 107327 (0x1a33f)
        ATTITUDE (attitude estimate valid)
        HORIZ_VEL (horizontal velocity estimate valid)
        VERT_VEL (vertical velocity estimate valid)
    ...

Tested locally with a variety of messages containing bitmasks.

[peterbarker]

... eg. 0b01011101 would seem to be better still for your goal..