Add SPQR to capabilities upload.

ts/background.ts

@@ -1875,6 +1875,7 @@ export async function startApp(): Promise<void> {
     try {
       await server.registerCapabilities({
         attachmentBackfill: true,
+        spqr: true,
       });
     } catch (error) {
       log.error(

ts/textsecure/WebAPI.ts

@@ -853,6 +853,7 @@ export type CapabilitiesType = {
 };
 export type CapabilitiesUploadType = {
   attachmentBackfill: true;
+  spqr: true;
 };
 
 type StickerPackManifestType = Uint8Array;
@@ -3220,6 +3221,7 @@ export function initialize({
 
       const capabilities: CapabilitiesUploadType = {
         attachmentBackfill: true,
+        spqr: true,
       };
 
       // Desktop doesn't support recovery but we need to provide a recovery password.
@@ -3284,6 +3286,7 @@ export function initialize({
     }: LinkDeviceOptionsType) {
       const capabilities: CapabilitiesUploadType = {
         attachmentBackfill: true,
+        spqr: true,
       };
 
       const jsonData = {