Use shield instead of checkmark in conversation settings view when users is not verified.

// FREEBIE

Signal/Images.xcassets/table_ic_not_verified.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "table_ic_not_verified@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "table_ic_not_verified@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "table_ic_not_verified@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Signal/src/ViewControllers/OWSConversationSettingsTableViewController.m

@@ -240,12 +240,16 @@ NS_ASSUME_NONNULL_BEGIN
     firstSection.customHeaderHeight = @(100.f);
 
     if (!self.isGroupThread && self.thread.hasSafetyNumbers) {
+        NSString *recipientId = self.thread.contactIdentifier;
+        BOOL isVerified = [[OWSIdentityManager sharedManager] verificationStateForRecipientId:recipientId]
+            == OWSVerificationStateVerified;
+
         [firstSection addItem:[OWSTableItem itemWithCustomCellBlock:^{
             return [weakSelf
                 disclosureCellWithName:
                     NSLocalizedString(@"VERIFY_PRIVACY",
                         @"Label for button or row which allows users to verify the safety number of another user.")
-                              iconName:@"table_ic_verify"];
+                              iconName:(isVerified ? @"table_ic_verify" : @"table_ic_not_verified")];
         }
                                   actionBlock:^{
                                       [weakSelf showVerificationView];