Correct display of version & git commit hash on about page

[benjaminvanrenterghem]

This is a small remark. If the repository has been cloned and the HEAD of the repository has been set to a specific commit hash, ensure the version and git commit hash are also displayed. This may be the case for installation procedures where compatibility needs to be guaranteed, achieved by explicitly setting the HEAD.

Command performed after cloning: git reset --hard 2fdafd34ca6c8f7f1415a3a1d89498bb575a7171
Resulting about page:

Due to it not being a release hash it could atleast show the commit hash.