Fix layout of table views vs. nav bar.

Signal/src/ViewControllers/ConversationView/Cells/OWSMessageCell.m

@@ -257,13 +257,13 @@ NS_ASSUME_NONNULL_BEGIN
         case 0:
             break;
         case 1:
-            return [UIFont ows_regularFontWithSize:basePointSize * 2.f];
+            return [UIFont ows_regularFontWithSize:basePointSize + 18.f];
         case 2:
-            return [UIFont ows_regularFontWithSize:basePointSize * 1.666f];
+            return [UIFont ows_regularFontWithSize:basePointSize + 12.f];
         case 3:
         case 4:
         case 5:
-            return [UIFont ows_regularFontWithSize:basePointSize * 1.333f];
+            return [UIFont ows_regularFontWithSize:basePointSize + 6.f];
         default:
             OWSFail(@"%@ Unexpected jumbomoji count: %zd", self.logTag, self.displayableText.jumbomojiCount);
             break;

Signal/src/ViewControllers/OWSTableViewController.m

@@ -398,7 +398,9 @@ NSString * const kOWSTableCellIdentifier = @"kOWSTableCellIdentifier";
 #pragma clang diagnostic pop
     }
     [self.view addSubview:self.tableView];
-    [self.tableView autoPinToSuperviewEdges];
+    [self.tableView autoPinWidthToSuperview];
+    [self.tableView autoPinToTopLayoutGuideOfViewController:self withInset:0];
+    [self.tableView autoPinToBottomLayoutGuideOfViewController:self withInset:0];
 
     [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:kOWSTableCellIdentifier];
 }