build(deps-dev): bump node-sass from 4.14.1 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.14.1 to 7.0.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/node-sass/compare/v4.14.1...v7.0.0)

---
updated-dependencies:
- dependency-name: node-sass
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -176,7 +176,7 @@
     "mocha": "^5.2.0",
     "multispinner": "^0.2.1",
     "node-loader": "^0.6.0",
-    "node-sass": "^4.14.1",
+    "node-sass": "^7.0.0",
     "require-dir": "^1.0.0",
     "sass-loader": "^7.0.3",
     "spectron": "^3.8.0",

src/renderer/components/FlightgearMap.vue

@@ -185,7 +185,7 @@ You should have received a copy of the GNU General Public License along with FG
         loadingInstance: Object,
         groundnetLoaded: false,
         pavementLoaded: false,
-        url: 'http://xjsjc.kongjian.xin:4200/tile/{z}/{x}/{y}.png',
+        url: 'https://a.tile.openstreetmap.de/{z}/{x}/{y}.png',
         attribution: '<A href="https://github.com/Portree-Kid/flightgear-airports" target="_blank">Flightgear Airports ' + require('electron').remote.app.getVersion() +
         '</A> <A href="https://www.electronjs.org/" target="_blank">Electron</A> ' +
         ' <A href="https://element.eleme.io/#/en-US/" target="_blank">element.io</A> ' +