Get rageshake endpoint from SdkConfig instead of storing in rageshake

- in preparation for factoring out the sending of the rageshake

src/components/views/dialogs/BugReportDialog.js

@@ -17,6 +17,7 @@ limitations under the License.
 import React from 'react';
 import sdk from 'matrix-react-sdk';
 import rageshake from '../../../vector/rageshake';
+import SdkConfig from 'matrix-react-sdk/lib/SdkConfig';
 
 export default class BugReportDialog extends React.Component {
     constructor(props, context) {
@@ -47,7 +48,9 @@ export default class BugReportDialog extends React.Component {
             return;
         }
         this.setState({ busy: true, err: null });
-        rageshake.sendBugReport(userText, sendLogs).then(() => {
+        rageshake.sendBugReport(
+            SdkConfig.get().bug_report_endpoint_url, userText, sendLogs,
+        ).then(() => {
             this.setState({ busy: false });
             this.props.onFinished(false);
         }, (err) => {