home: Reset the app grid state when unfolding

This includes clearing the search field and scrolling the list to the top.
5 jobs for reset-app-grid in 5 minutes and 57 seconds (queued for 14 seconds)
latest
Status Job ID Name Coverage
  Build
passed #138124
librem5
build:native

00:01:45

 
  Test
passed #138126
librem5
test:smoke:one-output

00:02:34

passed #138127
librem5
test:smoke:two-outputs

00:02:30

passed #138125
librem5
unit-test:native

00:02:10

6.1%
 
  Package
passed #138128
librem5
package:deb

00:01:36