Minor bug fixes to address in Salinity app

[matt001k]

What changed?

• Changed size of typedef buffer AanderaaConductivityString
• CMD_INTERVAL is reported as a float value on the 5990 not uint

How does it make Bristlemouth better?

Fixes bugs that address the Salinity app

Where should reviewers focus?

When reading the interval from the 5990 it is reported in exponential format:

command: Get Interval
command response: Interval      5990    75      1.000000E+02
command response: #
sendCommand err: 0

When examining this value as an int, it looks like the reading is 1 second rather than 100.
Casting the value to a float addresses this.

The string length for AanderaaConductivityString was too small for one specific parameter:

#define CMD_ENABLE_DERIVEDPARAMETERS "Enable Derived Parameters"

This breached the 32 char limit. Increasing this to 64 will address any immediate issues.

Checklist

• Add or update unit tests for changed code
• Ensure all submodules up to date. If this PR relies on changes in submodules, merge those PRs first, then point this PR at/after the merge commit
• Ensure code is formatted correctly with clang-format. If there are large formatting changes, they should happen in a separate whitespace-only commit on this PR after all approvals.