settings: fix not being able to overwrite the default value of string/addon settings with an empty value
Fix DXVA rendering for 10-Bit files
Merge pull request #4167 from Montellese/settings_overwrite_default_fix

settings: fix not being able to overwrite the default value of string/addon settings with an empty value
Merge pull request #4163 from Shine-/dxvarenderer

[dxva] Fix black screen when trying to render Hi10P video with DXVA2/DXVA-HD