src/photos-searchbar.c: Changed ctrl+a behaviour in search
Currently while searching photos by text, hitting the Ctrl+a key will select all photos that matched the query.
This can lead to unwanted behaviour, like searching for a term then hitting Ctrl+a Backspace in order to change the query term; this delete all found images.
To fix this, changed the search bar code for key pressing event in order to select the text instead of the photos.