remove isAdmin from mode reducer

src/reducers/mode.js

@@ -2,7 +2,6 @@ const SET_FULL_SCREEN = 'scratch-gui/mode/SET_FULL_SCREEN';
 const SET_PLAYER = 'scratch-gui/mode/SET_PLAYER';
 
 const initialState = {
-    isAdmin: true,
     showBranding: false,
     isFullScreen: false,
     isPlayerOnly: false,

test/unit/reducers/mode-reducer.test.js

@@ -12,7 +12,6 @@ test('initialState', () => {
 
 test('set full screen mode', () => {
     const previousState = {
-        isAdmin: true,
         showBranding: false,
         isFullScreen: false,
         isPlayerOnly: false,
@@ -23,7 +22,6 @@ test('set full screen mode', () => {
         isFullScreen: true
     };
     const newState = {
-        isAdmin: true,
         showBranding: false,
         isFullScreen: true,
         isPlayerOnly: false,
@@ -35,7 +33,6 @@ test('set full screen mode', () => {
 
 test('set player mode', () => {
     const previousState = {
-        isAdmin: true,
         showBranding: false,
         isFullScreen: false,
         isPlayerOnly: false,
@@ -46,7 +43,6 @@ test('set player mode', () => {
         isPlayerOnly: true
     };
     const newState = {
-        isAdmin: true,
         showBranding: false,
         isFullScreen: false,
         isPlayerOnly: true,