jam: fix button sizes, and update grid fb ids to invalid
jam: fix button sizes, and update grid fb ids to invalid

The grid fb id invalidation ensure that the existing (valid) ids
are not over-written, which the device_test app was doing.

Signed-off-by: Harry van Haaren <6e1296516ee88185cd60d9725251227ece1af74d@gmail.com>

openAVproductions/openAV-Ctlra