Bug 1060190 - Move the data connection settings from the per-sim panel to the upper panel

https://bugzilla.mozilla.org/show_bug.cgi?id=1060190
We already have one l10n id for this `messaging-sim-settings` and I think "SIM {{index}} Settings" is really a generic naming and can be shared together. And also, `sim-settings` is really like `simSettings`, so should we rename it to `simSettingsWithIndex` or something else ?