bower.json: remove moot `version` field
bower.json: remove moot `version` field

Per https://github.com/bower/bower.json-spec/commit/a325da3d79baab018c572d75dc1781b12322f6cd
elektronik2k5/dialog-polyfill,GoogleChrome/dialog-polyfill,GoogleChrome/dialog-polyfill,kublaj/dialog-polyfill,lozandier/dialog-polyfill,elektronik2k5/dialog-polyfill,huangxok/dialog-polyfill,samthor/dialog-polyfill,lozandier/dialog-polyfill,samthor/dialog-polyfill,huangxok/dialog-polyfill,kublaj/dialog-polyfill