Track telemetry pref changed event (#445)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

src/renderer/components/PreferencesPage.vue

@@ -122,7 +122,6 @@
               id="checkbox-allow-telemetry"
               switch
               v-model="preferences.allowTelemetry"
-              :disabled="licenceData && licenceData.status === 'valid'"
               @input="onSave"
             >
               Allow telemetry & usage tracking

src/renderer/store/index.js

@@ -47,6 +47,11 @@ export default new Vuex.Store({
       this.commit("savePreferences", userStore.getPreferences());
     },
     savePreferences(state, prefs) {
+      if (prefs.allowTelemetry) {
+        tracker.event("telemetry", "enabled")
+      } else {
+        tracker.event("telemetry", "disabled")
+      }
       state.preferences = prefs;
       userStore.setPreferences(prefs);
       this.dispatch("destroyWebviews")