Bug 40318: Remove check for DISPLAY env var in start-tor-browser

boklmrequested to merge
boklm/tor-browser-build:bug_40318 into master

When using Wayland, the DISPLAY environment variable does not need to be set, so the start-tor-browser script should not fail in that case.

Wayland support is still disabled by default in Firefox, and users who want to enable it will need to set the MOZ_ENABLE_WAYLAND environment variable.

Closes #40318 (closed).

/cc @Cortex65

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