Auto merge of #11687 - larsbergstrom:android_basedir, r=mbrubeck

Android basedir

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This fixes #11633, as when the new basedir stuff that uses xdg was added, it did not preserve the previous Android behavior, which used `/sdcard/servo`. Obviously, long-term we should be calling into the Android runtime to determine the per-run installation path and be both unpacking and loading resources from there, but this restores the previous behavior.

r? @mbrubeck

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- [ x] `./mach build -d` does not report any errors
- [x ] `./mach test-tidy` does not report any errors
- [x] These changes fix #11633 (github issue number if applicable).

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