Adjust generateGeohash from static to standard method to support singleton approach in Svelte without additonal import/exports

src/modules/stationData.ts

@@ -13,7 +13,7 @@ export class StationDataModule {
      * @param ln Longitude
      * @returns Geohash as string
      */
-    static generateGeohash(lt: number, ln: number): string {
+    generateGeohash(lt: number, ln: number): string {
         return Geohash.encode(lt, ln, 6);
     }