Fix about:tor assertion failure in esr68 linux debug builds
I found this assertion failure when testing #30429 (moved) in linux, debug build. It happens when loading about:tor:
Assertion failure: foundDefaultSrc (about: page must contain a CSP including default-src), at /home/user/tor/tor-browser/dom/base/Document.cpp:5179
We should investigate this, but not sure if it's tbb-9.0-must-nightly.
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