Revert "automatically disable signature requirement"
downgrading the warning color stopped working some time ago. for
completeness, as of nightly99 xpinstall.signatures.required is only
checked in these places, none of which affect us:
- nsContentSecurityUtils.cpp::DetectJsHacks()
only for telemetry and relaxing some security measures we don't need
- BrowserGlue.jsm::_onWindowsRestored()
gates call to _notifyUnsignedAddonsDisabled(), which isn't triggered
by our stuff (signedState != SIGNEDSTATE_MISSING)
- AddonSettings.jsm::REQUIRE_SIGNING
overridden by our config.js script, so doesn't matter
- XPIProvider.jsm::observe()
calls XPIDatabase.updateAddonAppDisabledStates(), which calls
this.updateAddonDisabledState(addon), which depends on
this.isUsableAddon(aAddon), which returns true as long as we override
this.isDisabledLegacy(aAddon)
This reverts commit
29dc0ab3a8f8bd6e781fb983cd076764480dce18.