Re-enable ping to stats server for linux

[aekeus]

This change re-enables the update check, used to send anonymous stats, for Linux.

The update check does not show the update bar, even if there is a newer version
of the software available. This will be addressed in a later commit.

Testing:

Testing this change from a QA perspective is problematic. These are the steps
I used to test the functionality of the change.

A)

• Change the version in package.json to a previous release version
• Build the binary on Linux
• Launch the browser ensuring:
  • The browser does not crash on update init
  • The updater scheduler is initiated
  • Metadata is retrieved from the updater
  • The updater bar is NOT shown
  • The browser does not crash
  • No attempt is made to update the browser binary

B)

• Change the browser version in package.json to a non-existent version
• Build on Linux and launch
• Ensure no metadata is retrieved
• Ensure that the ping is recorded in the dw.fc_usage table of stats

Auditors: @bbondy

Implements: #7562

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

Test Plan:

[bbondy]

thanks for taking this and for splitting it up.