fix(uf2): prevent being unable to flash when corrupted firmware present #6814
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This fixes UF2:
a bootloader design flaw where volume size does not allow to store 2 x max firmware size, therefore preventing a new firmware to be flashed is current firmware size is max firmware size. Size is now 33MB
a bug where current firmware size can report larger than max firmware size if a corrupted firmware is present
This fixes #6765