minitube: Update to 3.9

Changelog:
3.9
* default constructor needed by QVector

3.8.2
translation

3.8.1
cleanup

3.8
unknown

3.7
fix crash

3.6.7
unknown

3.6.6
handle thumb loading error

3.6.5
fix deprecated call

3.6.4
unknown

3.6.3
unknown

3.6.2
unused functions

3.6.1
http handling

3.6
fix recent search

3.5.1
unknown

(ryoon)