[Bug] Paste in editor context menu didn't work

[Cheese-Yu]

Describe the bug
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To Reproduce

Steps to reproduce the behavior:

1. enable webpack process polyfill
2. build and open monaco-editor
3. right click the editor menu and click paste, it paste nothing
4. right click the editor menu show "Ctrl+" in MacOs, but not "⌘+"
5. refer: [Bug] Paste in editor context menu broken on monaco-editor 0.47 microsoft/monaco-editor#4438

Or, please add a minimal code snippet to reproduce the issue, for example in codesandbox.

Expected behavior
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Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]: Mac
• Browser [e.g. chrome, safari]: chrome
• Version [e.g. 22]: 4.6.0

Additional context
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