Editing the keybinding to the same value in keybinding editor should not update keybindings.json

[ramya-rao-a]

• VSCode Version: Any
• OS Version: Any

Steps to Reproduce:

1. Open the keyboard shortcuts editor
2. Edit any keybinding. When prompted, enter the same keybinding as default. I chose the keybinding for the Continue command

Expected: No changes to the "Source" of the keybinding. No changes to the keybindings.json file
Actual: The "Source" changes from "Default" to "User". The keybindings.json file gets 2 entries.

[
    {
        "key": "f5",
        "command": "workbench.action.debug.continue",
        "when": "inDebugMode"
    },
    {
        "key": "f5",
        "command": "-workbench.action.debug.continue",
        "when": "inDebugMode"
    }
]