search.go: make quick search the default for media (V and S pins)

[Trek Hopton]

We have observed VidGrind crashing from exceeding the memory limit for media searches. To remedy this we should make quick search the default. We should even make it the ONLY method of search for media. A search shouldn’t contain all the media data for every result. This was discussed in issue #274.

We need to improve the links for each result in our existing quick search to make it usable. This will be a separate issue.

[Alan Noble]

Implemented in https://bitbucket.org/ausocean/vidgrind/commits/2ba0ec8d393bf0165c628413f48f24072b25ce09