chore: gitignore the generated wownerod embed

The build stages the wownerod binary into src/assets/wownerod/ and generates
src/assets_wownerod.qrc, exactly as it does for tor and docs — but only the tor
and docs paths were ignored. A `git add -A` in a build tree therefore offered a
24MB binary and a generated qrc for commit. Ignore them the same way.

.gitignore

@@ -14,9 +14,11 @@ feather_autogen/
 feather.cbp
 src/assets_tor.qrc
 src/assets_docs.qrc
+src/assets_wownerod.qrc
 feather.AppDir/*
 src/assets/tor/*
 src/assets/docs/*
+src/assets/wownerod/*
 !src/assets/tor/.gitkeep
 !src/assets/docs/.gitkeep
 contrib/installers/windows/setup.nsi