chore(globs): remove negated spec globs

Negating coffeescript globs that represent coffeescript tests should be
done in the relevant spell that uses them (e.g. spell-karma). If
someone does not have spell-karma or another test runner spell
installed, or use a different extension for test files, such as
`*.test.js`, then `*.spec.coffee` files should be treated like any
other `*.coffee` file.

Breaks:
- Without the `spell-karma` plugin, and the relevant update containing
the negating glob for `*.spec.coffee` in `globs.source.coffeescript`,
`*.spec.coffee` files will also be included in the build. If needed,
manually negate `*.spec.coffee` for `globs.source.coffeescript` in
`warlock.json`.