[icons] move babel/runtime to devDep

[eddiemonge]

@babel/runtime does not look like it is needed to run package so it
should be a devDependency

[mbrookes]

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

[eddiemonge]

@mbrookes I don't see that in the code anywhere.

[eps1lon]

@eddiemonge We need it because we transpile our code with @babel/plugin-transform-runtime.

[eddiemonge]

Ugh. That is so dirty. The babel runtime transform should be adding that code itself instead of requiring another package.