Height of plain <input type="week"> doesn't match height of other temporal <input>s in Chrome

Created by: cvrebert

As a side-effect of https://github.com/twbs/bootstrap/blob/6ba595f3fffee275922c377a7cc1bc46fc5e58c1/less/forms.less#L179 , the height of a plain <input type="week"> without any Bootstrap classes doesn't match the height of other plain temporal <input>s. Tested on OS X Chrome using http://jsfiddle.net/5Lh045wd/1/