[Release][CMake][Bugfix] Fix copy-and-paste error

Thanks for spotting that, Dominic!

(cherry picked from commit c849d756)
Signed-off-by: Steffen Müthing <muething@dune-project.org>

cmake/modules/DuneEnableAllPackages.cmake

@@ -95,7 +95,7 @@ function(dune_register_package_flags)
     get_property(all_incs GLOBAL PROPERTY ALL_PKG_INCS)
     get_property(all_libs GLOBAL PROPERTY ALL_PKG_LIBS)
     get_property(all_defs GLOBAL PROPERTY ALL_PKG_DEFS)
-    get_property(all_defs GLOBAL PROPERTY ALL_PKG_OPTS)
+    get_property(all_opts GLOBAL PROPERTY ALL_PKG_OPTS)
     set_property(GLOBAL PROPERTY ALL_PKG_INCS "${REGISTRY_INCLUDE_DIRS}" "${all_incs}")
     set_property(GLOBAL PROPERTY ALL_PKG_LIBS "${REGISTRY_LIBRARIES}" "${all_libs}")
     set_property(GLOBAL PROPERTY ALL_PKG_DEFS "${REGISTRY_COMPILE_DEFINITIONS}" "${all_defs}")