search: Check substrings of app IDs, not just prefixes

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Due to the way as_app_search_matches() works, "flatpak search" only
checks if the search text is a prefix of an element of the app ID, not
if it's any substring. Add a substring check, so for example you can
find SuperTuxKart using "flatpak search tuxkart".

Closes: #1161
Approved by: TingPing

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