Remove unnecessary `min-width` CSS rules
Remove unnecessary `min-width` CSS rules

 - For the findbar/secondaryToolbar case, the `min-width` rule doesn't really make sense since it's way too small to be useful. Furthermore, the findbar is already specifying its own `min-width` and the secondaryToolbar will (thanks to its buttons) receive a correct/useful width.

 - The pageNumber-input already has an *explicit* `width` set, hence setting the `min-width` rule as well is completely unnecessary.

 - The treeItem-links are supposed to *compute* their `min-width`, and the static value was only added as a fallback for older browsers without `calc()` support.

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