remove SESSION_REQUEST flag from DataMessage. now in envelope

protos/SignalService.proto

@@ -142,7 +142,6 @@ message DataMessage {
     PROFILE_KEY_UPDATE        = 4;
     SESSION_RESTORE           = 64;
     UNPAIRING_REQUEST         = 128;
-    SESSION_REQUEST           = 256;
   }
 
   message Quote {

ts/receiver/receiver.ts

@@ -344,8 +344,6 @@ export function processDecrypted(envelope: EnvelopePlus, decrypted: any) {
   } else if (decrypted.flags & FLAGS.PROFILE_KEY_UPDATE) {
     decrypted.body = '';
     decrypted.attachments = [];
-  } else if (decrypted.flags & FLAGS.SESSION_REQUEST) {
-    // do nothing
   } else if (decrypted.flags & FLAGS.SESSION_RESTORE) {
     // do nothing
   } else if (decrypted.flags & FLAGS.UNPAIRING_REQUEST) {
@@ -569,7 +567,6 @@ export async function handleMessageEvent(event: any): Promise<void> {
 
   const {
     PROFILE_KEY_UPDATE,
-    SESSION_REQUEST,
     SESSION_RESTORE,
   } = SignalService.DataMessage.Flags;