Bug Fix: Owner and module weren't getting added correctly.

[handstandsam]

1. We weren't actually updating the extras appropriately. (Didn't make the Map mutable and add to it)
2. We we would have only used the module's owner, but now if a code reference specifies an owner, it will use that override.

{
    "metadata": {
        "key": "android_tests",
        "description": "Android @Test(s)",
        "dataType": "CODE_REFERENCES",
        "category": "Android Tests",
        "extras": [
            {
                "key": "module",
                "type": "STRING",
                "description": "Module"
            },
            {
                "key": "owner",
                "type": "STRING",
                "description": "Owner"
            }
        ]
    },
    "values": [
        {
            "filePath": "apps/somemodule/src/main/SomeTest.kt",
            "startLine": 78,
            "endLine": 99,
            "extras": {
                "module": ":somemodule",
                "owner": "SomeOwner"
            },
            "code": "...",
        },
    ]
}