fix: code style in generators for field colour blocks

[rachel-fenichel]

The basics

• [x] I validated my changes

The details

Resolves

Fixes #2198

Proposed Changes

Code style fixes in generators. Only one change impacts the generated code (Math.pow(2,24) -> 0x1000000), which also caused a corresponding change in the generated files.

Reason for Changes

Cleanup since I was already touching this code.

Test Coverage

Generator tests cover this!