This matches the W008 and W047 warnings that JSHint already emits for us.
(As seen at https://code.wildfiregames.com/D1993#83345).
The equivalent rule in ESLint is no-floating-decimal. Enable this so developers can
detect this while writing code in IDEs with an ESLint plugin (which is more widely
available than the now-lesser maintainer JSHint, and more contributors will have
this installed already).
It also means we can auto-fix them in the future with eslint --fix.
This commit fixes the two violations that existed in the code base. Thus, enabling this
won't add any Vulcan noise.