Don't hide "set as default browser" on Android 5 & 6

[sblatz]

In #382 we hid the default browser toggle on these lower versions for MVP.

As suggested by Vesta, we should unhide this toggle and use it to link to the sumo article (which is what we did in Focus): https://support.mozilla.org/en-US/kb/how-set-firefox-preview-your-default-browser-android

This would also deal with #5870 as users could access that toggle.

┆Issue is synchronized with this Jira Task

[sblatz]

Updated behavior:

[AndiAJ]

Hi, I've check on the latest debug build from Master 1.0.1941 11/10 using the following devices:
• Samsung Galaxy S6 (Android 6.0.1)
• OnePlus A3 (Android 6.0.1)
• LG Nexus 4 (Android 5.1.1)
• Samsung Galaxy Tab Active (Android 5.1.1)

The "Set as default browser" section is indeed displayed on the other hand there is no redirecting made to the newly opened page (sumo article).
You need to check and navigate t it from the Open tabs section.

Similar behavior trying to "disable" the toggle.

► Enable

► Disable

@sblatz Please review and let us know if the user should automatically redirected to the sumo article.
Until then I'll remove the QA needed label.

[AndiAJ]

Hi, verified as fixed on the latest Nightly build #12880607 from 15/10 using the following devices:

• Samsung Galaxy S6 (Android 6.0.1)
• OnePlus A3 (Android 6.0.1)
• LG Nexus 4 (Android 5.1.1)
• Samsung Galaxy Tab Active (Android 5.1.1)

► Enable

► Disable