Conform more code to strict null checking (#10169)

* Conform more code to strict null checking

* delint

* Iterate

* delint

* Fix bad test

test/components/views/messages/MKeyVerificationConclusion-test.tsx

@@ -50,10 +50,10 @@ describe("MKeyVerificationConclusion", () => {
     }) => {
         class MockVerificationRequest extends EventEmitter {
             constructor(
-                public readonly pending: boolean,
-                public readonly cancelled: boolean,
-                public readonly done: boolean,
-                public readonly otherUserId: string,
+                public readonly pending?: boolean,
+                public readonly cancelled?: boolean,
+                public readonly done?: boolean,
+                public readonly otherUserId?: string,
             ) {
                 super();
             }

test/components/views/messages/MLocationBody-test.tsx

@@ -140,7 +140,9 @@ describe("MLocationBody", () => {
             });
 
             it("opens map dialog on click", () => {
-                const modalSpy = jest.spyOn(Modal, "createDialog").mockReturnValue(undefined);
+                const modalSpy = jest
+                    .spyOn(Modal, "createDialog")
+                    .mockReturnValue({ finished: new Promise(() => {}), close: jest.fn() });
                 const component = getComponent();
 
                 act(() => {

test/components/views/messages/MessageEvent-test.tsx

@@ -63,7 +63,7 @@ describe("MessageEvent", () => {
             event = mkEvent({
                 event: true,
                 type: VoiceBroadcastInfoEventType,
-                user: client.getUserId(),
+                user: client.getUserId()!,
                 room: room.roomId,
                 content: {
                     state: VoiceBroadcastInfoState.Started,