[Bug 1762952] [NEW] Alternative shortcut for layout switching Alt+Shift unexpectedly set by default

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Version: Ubuntu 18.04 Final Beta with default Gnome Shell included in
18.04

Steps to reproduce:
1. Define two keyboard input methods in Settings -> Region & Language -> Input Sources
2. Open several applications
3. Observe that application windows can be iterated with Alt + Tab
4. Once application window iteration was begun with Alt + Tab, try to iterate backwards with Alt + Shift + Tab.
5. Try to change keyboard input method switching hotkeys in Settings -> Region & Language -> Input Sources -> Options.
6. Observe that Keyboard shortcut for "Alternative switch to next source" is set to "Alt + Shift" and that keyboard shortcuts can only be changed in Settings -> Devices -> Keyboard -> Keyboard Shortcuts.
7. Observe that the shortcut for "Alternative switch to next source" is not available for configuration in Settings -> Devices -> Keyboard -> Keyboard Shortcuts.

Actual state:
* Performing step 4 does not select the previous app in application switcher but instead changes  keyboard input method.

Expected state:
* The shortcut for "Alternative switch to next source" can be changed and / or deactivated in Settings -> Devices -> Keyboard -> Keyboard Shortcuts.

Notes:
* The above was working fine in Ubuntu 17.10. I assume "Alternative switch to next source" did not exist in that version of Gnome Shell.

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: High
         Status: Confirmed

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Alternative shortcut for layout switching Alt+Shift unexpectedly set by default
https://bugs.launchpad.net/bugs/1762952
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