Use 64bit containers to build 32bit Windows Tor Browser
Currently we use a 32bit container to build the Windows 32bit Tor Browser. I think we could do it from a 64bit container.
Doing that would:
- reduce the number of container images we generate and store, as we would then use the same ones for the 32bit and 64bit builds
- avoid potential memory limitations in the future (similarly to #26323 (moved))