Remove unused `store.getState` stubs in tests

All of the components use selector methods now instead of accessing the
store's internal state directly.

src/sidebar/components/test/AnnotationView-test.js

@@ -14,7 +14,6 @@ describe('AnnotationView', () => {
   beforeEach(() => {
     fakeStore = {
       clearAnnotations: sinon.stub(),
-      getState: sinon.stub().returns({}),
       highlightAnnotations: sinon.stub(),
       routeParams: sinon.stub().returns({ id: 'test_annotation_id' }),
       profile: sinon.stub().returns({ userid: null }),

src/sidebar/components/test/SidebarPanel-test.js

@@ -17,11 +17,6 @@ describe('SidebarPanel', () => {
     fakeScrollIntoView = sinon.stub();
 
     fakeStore = {
-      getState: sinon.stub().returns({
-        sidebarPanels: {
-          activePanelName: null,
-        },
-      }),
       isSidebarPanelOpen: sinon.stub().returns(false),
       toggleSidebarPanel: sinon.stub(),
     };

src/sidebar/components/test/StreamView-test.js

@@ -30,7 +30,6 @@ describe('StreamView', () => {
       annotationFetchStarted: sinon.stub(),
       annotationFetchFinished: sinon.stub(),
       clearAnnotations: sinon.spy(),
-      getState: sinon.stub().returns({}),
       routeParams: sinon.stub().returns({ id: 'test' }),
       setSortKey: sinon.spy(),
     };