eliminate visual glitching when updating a setting

Information

• Solaar version (solaar --version and git describe --tags): 1.1.6

Is your feature request related to a problem? Please describe.

Some setting displays glitch when updated, maybe only range settings. For a very short time, a spinner is displayed and the size of the setting control is reduced.

Describe the solution you'd like

The size of the setting control should not change.