Indicate that search is active

[Rikuoja]

Currently, if the user closes the search panel after typing text in the search field, only the items matching the search are visible on the map.

Therefore, we want to indicate that the search is still active and the user has to empty the search field to display all points again. Do this somehow by changing the search icon.

Similar to the filter icon, in that the hidden contents in both determine what is visible on the map. So the indicator should be similar.

We should indicate whether the map is showing the filtered layers (as is the default), or the searched points.