Qtscenegraph-adaptation missing version in RPM SPEC

Filing it here as it sounds that https://git.sailfishos.org/mer-core/qtscenegraph-adaptation will move anyway.

In rpm/qtscenegraph-adaptation-droid.spec, Version is adjusted according to the release. Right now we have

Version:    git 
Release:    1%{?dist}

and repository tagged with 0.7.6.

As RPM SPEC is provided in repository, please adjust versioning info and update SPEC with every release to be in sync with the tag.