Keybindings GUI is ignoring `category` defined in extension command

[usernamehw]

Issue Type: Bug

Using similar contribution in extension:

"contributes": {
    "commands": [
        {
            "command": "extension.do",
            "title": "title",
            "category": "Category"
        },
    ]
}

Command palette is doing it correctly: Category: title

Keybinginds is only showing title.

VS Code version: Code 1.29.1 (bc24f98, 2018-11-15T19:13:36.375Z)
OS version: Windows_NT x64 10.0.17134

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• A call for more extension categories (#20558)

[YisraelV]

I'm going to work on this.