Revert "GVFSVerb: Use OAuth credentials by default"

This reverts commit abcb73f.

Using this authentication mode by default is breaking some automated
scenarios on build agents that use "gvfs clone". Removing the new
default is a fast measure to fix these users, while a longer-term
consideration for increasing adoption of OAuth can be done at a later
date with the proper parties engaged.

GVFS/GVFS/CommandLine/GVFSVerb.cs

@@ -312,11 +312,6 @@ public static bool TrySetRequiredGitConfigSettings(Enlistment enlistment)
 
                 // Disable the builtin FS Monitor in case it was enabled globally.
                 { "core.useBuiltinFSMonitor", "false" },
-
-                // Set the GCM credential method to use OAuth tokens.
-                // See https://github.com/git-ecosystem/git-credential-manager/blob/release/docs/configuration.md#credentialazreposcredentialtype
-                // for more information.
-                { "credential.azreposCredentialType", "oauth" },
             };
 
             if (!TrySetConfig(enlistment, requiredSettings, isRequired: true))