Bug#940712: obs-studio: wrong version number in title bar and about dialog

[Kurt Kartaltepe <kkartaltepe@gmail.com>]

Please fix the packaging to properly assign the package version at
run-time. You can reference the following patch:

--- a/debian/rules
+++ b/debian/rules
@@ -13,6 +13,7 @@ override_dh_auto_configure:
        dh_auto_configure -- \
                -DOBS_MULTIARCH_SUFFIX=/$(DEB_HOST_MULTIARCH) \
                -DUNIX_STRUCTURE=1 \
+               -DOBS_VERSION_OVERRIDE=${DEB_VERSION_UPSTREAM} \
                -DDISABLE_UPDATE_MODULE=TRUE \
                -DBUILD_CAPTIONS=0