Bugfixes and Updated Finnish Translation

This is a very small snapshot update, mostly released for testing whether it fixes a crash (#2675), but also bringing the Finnish translation up to date thanks to a great effort by Tuomas Lähteenmäki.

I expect to do another small snapshot update next week, closely followed by Tiled 1.3.2.

Changelog

Thorbjørn Lindeijer

• Fixed the tileset view to respect the 'wheel zooms by default' preference
• Fixed potentially wrong world shown when using patterns and loading multiple worlds (#2675)
• Updated macOS and Linux builds to Qt 5.12.6

Tuomas Lähteenmäki

• Updated Finnish translation