Get rid of the amplitude error_encountered for ResizeObserver undefin…

…ed (#167)

We handle it gracefully enough and removing this might give us some breathing room in Amplitude
(we're close to the limits of what we can send in our free account)

index.html

@@ -1349,9 +1349,7 @@ <h2>Sharing theme</h2>
 
     function initScalingFontSize() {
       if ("ResizeObserver" in window === false) {
-        amplitude.getInstance().logEvent("error_encountered", {
-          message: "ResizeObserver not supported",
-        });
+        // Old browser without a ResizeObserver, leave font size as defaults
         return;
       }