Filled icons in the sensor-observation card

[manuelzomer]

Describe the bug
Some of the sensor icons in the sensor-observation card don't use the filled-icon version.

To Reproduce
Steps to reproduce the behavior:

1. Create an experiment
2. Click on "add sensor note"
3. Note that some sensor icons (f. ex. Accelerometer X, Y and Z) are not "filled"

Expected behavior
The icons in the sensor-observation card should all use the filled version. This is also the behaviour on iOS.

Screenshots