Ignore fanSpeed key when looking for fan speeds (#593)

* Ignore fanSpeed key when looking for fan speeds

---------

Co-authored-by: Cameron <32912464+kiwi-cam@users.noreply.github.com>
Co-authored-by: banboobee <98196664+banboobee@users.noreply.github.com>

accessories/fan.js

@@ -115,16 +115,13 @@ class FanAccessory extends SwitchAccessory {
     this.reset();
 
     // Create an array of speeds specified in the data config
-    const foundSpeeds = [];
-    const allHexKeys = Object.keys(data || {});
-
-    allHexKeys.forEach((key) => {
-      const parts = key.split('fanSpeed');
-
-      if (parts.length !== 2) {return;}
-
-      foundSpeeds.push(parts[1])
-    })
+    const foundSpeeds = Object.keys(data || {}).reduce((accu, key) => {
+      const match = key.match(/fanSpeed(\d+)/);
+      if (match && match[1]) {
+          accu.push(match[1]);
+      }
+      return accu;
+    }, []);
 
     if (config.speedCycle && config.speedSteps) {
       for (let i = 1; i <= config.speedSteps; i++) {