Search input text appears truncated when cancel button is displayed

[cycleseven]

I guess this isn't intentional. Seems like it could be fixed by matching the input padding size and the cancel button width.

https://github.com/deweyapp/dewey/blob/master/css/main.css#L166
https://github.com/deweyapp/dewey/blob/master/css/main.css#L180

Happy to open a PR for this if the maintainers are open to it!