Bug 1544517 - On GeckoView default to treating mouse inputs as mouse. r=snorp

Differential Revision: https://phabricator.services.mozilla.com/D29484

--HG--
extra : moz-landing-system : lando

mobile/android/app/geckoview-prefs.js

@@ -50,3 +50,6 @@ pref("browser.safebrowsing.features.trackingProtection.update", true);
 pref("browser.safebrowsing.features.cryptomining.update", true);
 // Enable fingerprinting protection blocklist updates
 pref("browser.safebrowsing.features.fingerprinting.update", true);
+
+// Treat mouse as touch only on TV-ish devices
+pref("ui.android.mouse_as_touch", 2);