D16617: fix extraction of GPS altitude for exif data

[Alexander Stippich]

astippich added a dependency: D16560: create a separate test file for embedded images test.

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D16617

To: astippich, #frameworks, bruns
Cc: kde-frameworks-devel, #baloo, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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