Make default format arg protected

Author: bwateratmsft

packages/vscode-container-client/src/clients/DockerClientBase/DockerClientBase.ts

@@ -135,7 +135,7 @@ export abstract class DockerClientBase extends ConfigurableClient implements ICo
     /**
      * The default argument given to `--format`
      */
-    public readonly defaultFormatForJson: string = "{{json .}}";
+    protected readonly defaultFormatForJson: string = "{{json .}}";
 
     //#region Information Commands
 

packages/vscode-container-client/src/clients/PodmanClient/PodmanClient.ts

@@ -59,7 +59,7 @@ export class PodmanClient extends DockerClientBase implements IContainersClient
     /**
      * The default argument given to `--format`
      */
-    public readonly defaultFormatForJson: string = "json";
+    protected readonly defaultFormatForJson: string = "json";
 
     /**
      * Constructs a new {@link PodmanClient}