Fix issue where CPU is continuously pegged when scrolling

Since should_queue is continuosly getting set, this is causing the
InnerTimelineView to continuously rerender, pegging the CPU to 100%

This change only updates the var if it changes from the previous value.

damus/Views/TimelineView.swift

@@ -32,7 +32,10 @@ struct TimelineView: View {
         guard offset >= 0 else {
             return
         }
-        self.events.should_queue = offset > 0
+        let val = offset > 0
+        if self.events.should_queue != val {
+            self.events.should_queue = val
+        }
     }
     
     var realtime_bar_opacity: Double {