[cmake,bugfix] Install <dune-module>-config-version.cmake

The name of the file changed in one of the recent patches. This
change is now also reflected in the install directive. Fixes #1426

cmake/modules/DuneMacros.cmake

@@ -846,7 +846,7 @@ endif()
 
   # install cmake-config files
   install(FILES ${PROJECT_BINARY_DIR}/cmake/pkg/${ProjectName}-config.cmake
-    ${PROJECT_BINARY_DIR}/${ProjectName}-version.cmake
+    ${PROJECT_BINARY_DIR}/${ProjectName}-config-version.cmake
     DESTINATION ${DUNE_INSTALL_LIBDIR}/cmake/${ProjectName})
 
   #install config.h