Remove duplicated height in CSS - fixes #2027

[McLaynV]

The following changes are implemented

Remove duplicate height: $input-height; in CSS.

Changes in the user interface:

none

Checklist when submitting a final (!draft) PR

• [x] Commits are tidied up, squashed if needed and follow guidelines in CONTRIBUTING.md
• [ ] Code builds
• [ ] All existing tests pass
• [ ] All new critical code is covered by tests
• [x] PR is linked to the relevant issue(s)
• [x] Rebased with the target branch

[Fajfa]

Not sure i wanna mess with bootstrap files.