Minor change required for Pale Moon 30+ compatibility

[dawidi]

The addon's UI components currently do not work on the just-released Pale Moon 30.0.x - it mis-detects the browser as an Australis-based Firefox (because the version number was incremented and the GUID changed back to the one used by Firefox), but that is easy to fix:

In requestpolicy/src/conditional/legacy/content/bootstrap/api/misc-infos.ts at line 34, the test should probably be updated from
public isAustralis: boolean = this.isFirefox && this.vc.compare(this.appinfo.platformVersion, "29") >= 0;
to
public isAustralis: boolean = this.isFirefox && this.isGecko;

For my own usage, I've replaced the test entirely with just false in the xpi without actually rebuilding the addon, and it works fine.