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.

We set the version in build time from the tag, so updating the version field in the spec is not necessary.