Corrects method usage in ECT method

Author: jonesiscoding

composer.json

@@ -14,7 +14,7 @@
     "retina"
   ],
   "homepage": "https://github.com/jonesiscoding/device",
-  "version": "4.0.2",
+  "version": "4.0.3",
   "suggest": {
     "deviscoding/poly-pointer": "Psuedo-Polyfill for (pointer:coarse). Easy support of touch devices."
   },

src/Device/Preferences.php

@@ -62,7 +62,7 @@ public function isSaveData()
     {
       return $header;
     }
-    elseif (in_array($this->getHint(Hints::HEADER_ECT), ['slow-2g', '2g', '3g']))
+    elseif (in_array($this->getHeader(Hints::HEADER_ECT), ['slow-2g', '2g', '3g']))
     {
       return true;
     }