Pause cursor render layer before resuming

Fixes #2764

src/browser/renderer/CursorRenderLayer.ts

@@ -364,6 +364,9 @@ class CursorBlinkStateManager {
   }
 
   public resume(): void {
+    // Clear out any existing timers just in case
+    this.pause();
+
     this._animationTimeRestarted = undefined;
     this._restartInterval();
     this.restartBlinkAnimation();