Invert scroll wheel behavior

Change-Id: I76f2ccf75c9b675bfc5954a91c7a5ec97364f17f
diff --git a/tools/winscope/src/app/components/timeline/mini-timeline/mini_timeline_component.ts b/tools/winscope/src/app/components/timeline/mini-timeline/mini_timeline_component.ts
index 225282e..c0c960e 100644
--- a/tools/winscope/src/app/components/timeline/mini-timeline/mini_timeline_component.ts
+++ b/tools/winscope/src/app/components/timeline/mini-timeline/mini_timeline_component.ts
@@ -303,7 +303,7 @@
         xPosInCanvas
       );
 
-      if (event.deltaY > 0) {
+      if (event.deltaY < 0) {
         this.zoomIn(zoomTo);
       } else {
         this.zoomOut(zoomTo);