Remove unnecessary userAgent Checks (#118)

For some reason "Mac" and "Chrome" were included, stopping live spectrogram on Macs. Only needs to be iPhone because it doesn't work on there. Tested on Mac FF, Chrome & Safari.

scripts/spectrogram.php

@@ -126,7 +126,7 @@ window.onload = function(){
   };
 
   // if user agent includes iPhone or Mac use legacy mode
-  if(((window.navigator.userAgent.includes("iPhone") || window.navigator.userAgent.includes("Mac")) && !window.navigator.userAgent.includes("Chrome")) || legacy == true) {
+  if(window.navigator.userAgent.includes("iPhone") || legacy == true) {
     document.getElementById("spectrogramimage").style.display="";
     document.body.querySelector('canvas').remove();
     document.getElementById('player').remove();