Fix error : "TypeError: this.statusbar_buttons.push is not a function"

[haflinger]

What does this implement/fix? Explain your changes.

When activating Pico-Go extension, the extension throw an error. To prevent this I have change the check from :

    if (this.statusbar_buttons == undefined || this.statusbar_buttons == '') {
          this.statusbar_buttons = ['status', 'connect', 'upload', 'download',
            'run', 'softreset'
          ];
    }

to :

    if (!Array.isArray(typeof this.statusbar_buttons)) {
      this.statusbar_buttons = ['status', 'connect', 'upload', 'download',
        'run', 'softreset'
      ];
    }

Does this close any currently open issues?

Close #113

Any relevant logs, error output, etc?

Any other comments?

Where has this been tested?

Tested in VSC debugger.

Operating system: macOS Monterey 12.1

VSCode version: 1.63.2

Pico-Go version: 1.4.3