Replace MatrixClient.isCryptoEnabled by MatrixClient.getCrypto (#140)

* Replace `MatrixClient.isCryptoEnabled` by `MatrixClient.getCrypto`

* Cast `cryptoEnabled` as `boolean`

* Fix `MatrixChat-test`

(cherry picked from commit 950ab1940bfcea9443f03284f9175d319c13a44c)

test/unit-tests/components/views/right_panel/UserInfo-test.tsx

@@ -142,7 +142,6 @@ beforeEach(() => {
         isUserIgnored: jest.fn(),
         getIgnoredUsers: jest.fn(),
         setIgnoredUsers: jest.fn(),
-        isCryptoEnabled: jest.fn(),
         getUserId: jest.fn(),
         getSafeUserId: jest.fn(),
         getDomain: jest.fn(),
@@ -424,7 +423,6 @@ describe("<UserInfo />", () => {
 
     describe("with crypto enabled", () => {
         beforeEach(() => {
-            mockClient.isCryptoEnabled.mockReturnValue(true);
             mockClient.doesServerSupportUnstableFeature.mockResolvedValue(true);
             mockCrypto.getUserVerificationStatus.mockResolvedValue(new UserVerificationStatus(false, false, false));
 
@@ -663,7 +661,6 @@ describe("<UserInfo />", () => {
 
     describe("with an encrypted room", () => {
         beforeEach(() => {
-            mockClient.isCryptoEnabled.mockReturnValue(true);
             mockClient.isRoomEncrypted.mockReturnValue(true);
         });