fix(forge): fix debugger buffer-write highlight else-if fallthrough

[emo-eth]

Motivation

Was a bit late pushing my last commit to #7110, apologies cc @DaniPopes

The check on read_accesses should check both that it's Some and that the active buffer matches, else writes to the memory buffer won't get highlighted.

This doesn't feel particularly elegant, so let me know if there's a better way to check if a member is Some and check against a member of that member in the same conditional.

As noted in a comment in the previous PR, behavior should be tweaked in the future to allow simultaneous read+write highlights for MCOPY

Solution

[DaniPopes]

This kind of condition is doable with the unstable let-chains:

if let Some((kind, _)) = accesses.read
    && kind == self.active_buffer

Otherwise this is fine