Simplify NotesView

src/ControlWindow.vala

@@ -169,15 +169,8 @@ class ControlView : DrawingArea {
 }
 
 class NotesView : TextView {
-	TextBuffer buffer;
-
-	public NotesView() {
-		buffer = new TextBuffer(null);
-		set_buffer(buffer);
-	}
-
 	public void set_text(string text) {
-		buffer.set_text(text, (int) text.length);
+		buffer.text = text;
 	}
 }