Fix linter no-duplicate-imports errors (#102)

Author: jreyesr

src/types/leaflet_plus.d.ts

@@ -1,4 +1,3 @@
-import 'leaflet';
 import { DivOverlay, DivOverlayOptions } from 'leaflet';
 
 declare module 'leaflet' {

src/worldmap.ts

@@ -4,7 +4,6 @@ import './libs/leaflet_plus';
 import * as L from 'leaflet';
 import WorldmapCtrl from './worldmap_ctrl';
 import { ColorModes } from './model';
-import { LatLngExpression } from 'leaflet';
 
 const tileServers = {
   'CARTO Positron': {
@@ -500,7 +499,7 @@ export default class WorldMap {
     // controls the map centering and zoom level.
     const mapDimensions = this.ctrl.settings.center;
 
-    let coordinates: LatLngExpression = [mapDimensions.mapCenterLatitude, mapDimensions.mapCenterLongitude];
+    let coordinates: L.LatLngExpression = [mapDimensions.mapCenterLatitude, mapDimensions.mapCenterLongitude];
     let zoomLevel = mapDimensions.mapZoomLevel;
 
     if (mapDimensions.mapFitData) {