Calculator: Taskbar and start menu jumplist items should not be pinnable/unpinnable or removable

[adrianghc]

Describe the bug
A few months ago, the calculator added items to the jumplist you can show in the taskbar or start menu. There are items for the default, scientific, programmer, and date conversion modes. It's a great addition but the items on this list can be pinned, unpinned or even removed from the list, which I feel should not be possible. E.g., what happens when you remove an entry? Can you bring it back then? I think it would be more appropriate to do it like e.g. Edge or Your Phone, where there are static items that you can neither pin nor unpin or remove.

Steps To Reproduce
Right-click on the calculator on either the taskbar or start menu, then right-click on any of the jumplist's items. All items display options for pinning or unpinning/removing.

Expected behavior
Right-clicking any jumplist items should only show an "open" option.

Screenshots
This is how it looks like:

This is how I feel it should be like:

Device and Application Information (please complete the following information):

• OS Build: 17134.590
• Architecture: x64
• Application Version: 10.1812.10048.0

[MicrosoftIssueBot]

This is your friendly Microsoft Issue Bot. I've seen this issue come in and have gone to tell a human about it.

[grochocki]

Good catch! I appreciate the thoroughness of your bug report. I agree that pin/unpin should not be enabled for these static items.

[MahdiGhiasi]

Other than pin/unpin, user can also remove items from the jumplist, but then they get added on next app launch. This can be confusing to the users.

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It seems that the only way for UWP apps to remove pin/unpin and remove ability from jumplist items is to not specify a group name for them. The downside is, the header for jumplist items will be "Tasks" instead of the current header title which is "Calculator".

If this tradeoff is managable, I've submitted PR #499 to do it.