Remove unused getDefaultToolbarButtons now that they're pushed to extension

src/utils/getDefaultToolbarButtons.js

@@ -1,60 +0,0 @@
-export default function() {
-  return [
-    {
-      command: 'StackScroll',
-      type: 'tool',
-      text: 'Stack Scroll',
-      icon: 'bars',
-      active: false,
-    },
-    {
-      command: 'Zoom',
-      type: 'tool',
-      text: 'Zoom',
-      icon: 'search-plus',
-      active: false,
-    },
-    {
-      command: 'Wwwc',
-      type: 'tool',
-      text: 'Levels',
-      icon: 'level',
-      active: true,
-    },
-    {
-      command: 'Pan',
-      type: 'tool',
-      text: 'Pan',
-      icon: 'arrows',
-      active: false,
-    },
-    {
-      command: 'Length',
-      type: 'tool',
-      text: 'Length',
-      icon: 'measure-temp',
-      active: false,
-    },
-    /*{
-        command: 'Annotate',
-        type: 'tool',
-        text: 'Annotate',
-        icon: `icon-tools-measure-non-target`,
-        active: false
-    },*/
-    {
-      command: 'Angle',
-      type: 'tool',
-      text: 'Angle',
-      icon: 'angle-left',
-      active: false,
-    },
-    {
-      command: 'reset',
-      type: 'command',
-      text: 'Reset',
-      icon: 'reset',
-      active: false,
-    },
-  ];
-}

src/utils/getDefaultToolbarButtons.test.js

@@ -1,9 +0,0 @@
-import getDefaultToolbarButtons from './getDefaultToolbarButtons.js';
-
-describe('getDefaultToolbarButtons.js', () => {
-  it('returns a non-empty array', () => {
-    const buttons = getDefaultToolbarButtons();
-
-    expect(buttons.length).toBeGreaterThan(0);
-  });
-});