Ensure elements on Login page are disabled when in-flight (#12895)

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/structures/auth/Login.tsx

@@ -485,6 +485,7 @@ export default class LoginComponent extends React.PureComponent<IProps, IState>
                 fragmentAfterLogin={this.props.fragmentAfterLogin}
                 primary={!this.state.flows?.find((flow) => flow.type === "m.login.password")}
                 action={SSOAction.LOGIN}
+                disabled={this.isBusy()}
             />
         );
     };
@@ -558,6 +559,7 @@ export default class LoginComponent extends React.PureComponent<IProps, IState>
                     <ServerPicker
                         serverConfig={this.props.serverConfig}
                         onServerConfigChange={this.props.onServerConfigChange}
+                        disabled={this.isBusy()}
                     />
                     {this.renderLoginComponentForFlows()}
                     {footer}