Minor UI fix

src/panel/graph_panel/partials/tab_analytics.html

@@ -272,7 +272,7 @@
             <select class="gf-form-input width-8"
               ng-model="analyticUnit.seasonalityPeriod.unit"
               ng-change="ctrl.onSeasonalityChange(analyticUnit.id)"
-              ng-options="type for type in ['seconds', 'minutes', 'days', 'hours', 'days', 'years']"
+              ng-options="type for type in ['seconds', 'minutes', 'hours', 'days', 'years']"
             />
           </div>
         </div>