Reinstate notification when SignalAccounts change

// FREEBIE

Signal/src/ViewControllers/DebugUI/DebugUIContacts.m

@@ -46,6 +46,10 @@ NS_ASSUME_NONNULL_BEGIN
                                                            actionBlock:^{
                                                                [DebugUIContacts deleteAllContacts];
                                                            }],
+                                           [OWSTableItem itemWithTitle:@"Clear SignalAccount Cache"
+                                                           actionBlock:^{
+                                                               [DebugUIContacts clearSignalAccountCache];
+                                                           }],
                                        ]];
 }
 
@@ -1280,6 +1284,12 @@ NS_ASSUME_NONNULL_BEGIN
                     }];
 }
 
++ (void)clearSignalAccountCache
+{
+    DDLogWarn(@"%@ Deleting all signal accounts.", self.logTag);
+    [SignalAccount removeAllObjectsInCollection];
+}
+
 + (void)deleteAllContacts
 {
     [self deleteContactsWithFilter:^(CNContact *contact) {

Signal/src/contact/OWSContactsManager.m

@@ -273,6 +273,10 @@ NSString *const OWSContactsManagerSignalAccountsDidChangeNotification
     self.signalAccountMap = [signalAccountMap copy];
     self.signalAccounts = [signalAccounts copy];
     [self.profileManager setContactRecipientIds:signalAccountMap.allKeys];
+
+    [[NSNotificationCenter defaultCenter]
+        postNotificationNameAsync:OWSContactsManagerSignalAccountsDidChangeNotification
+                           object:nil];
 }
 
 // TODO dependency inject, avoid circular dependencies.