Revision on https://github.com/odoo/odoo/commit/9de1bc0
From the commit above, the style of some field binary images are broken.
This is due to changes from `<span>` to `<button>`. The style has been
altered by the default browser's style, which does the following on
Google Chrome:
```
border-color: white;
border: 1px solid;
padding: 1px 7px 2px;
```
Most browsers set a border and some padding on buttons. This commit fixes
the style specifically for "font awesome" icons on buttons, by removing
the border and by overwriting the padding.
Tested browsers:
- Google Chrome 67
- Mozilla Firefox 61
- Safari 11
Task-ID 1864027
Closes#25691
Kishan Gajjar
7fa1525921