Improve StringMap typing in jami-swig

Change-Id: I3773d7353878de9f5f01f957287afe48c6977e8b
diff --git a/server/src/jamid/jamid.ts b/server/src/jamid/jamid.ts
index 48c20f2..1b7ba40 100644
--- a/server/src/jamid/jamid.ts
+++ b/server/src/jamid/jamid.ts
@@ -106,7 +106,7 @@
   }
 
   setAccountDetails(accountId: string, accountDetails: AccountDetails) {
-    const accountDetailsStringMap: StringMap = new (this.jamiSwig as any).StringMap();
+    const accountDetailsStringMap: StringMap = new this.jamiSwig.StringMap();
     for (const [key, value] of Object.entries(accountDetails)) {
       accountDetailsStringMap.set(key, value);
     }
@@ -114,8 +114,7 @@
   }
 
   async addAccount(details: Map<string, string | number | boolean>) {
-    // TODO: Add proper typing directly into JamiSwig
-    const detailsStringMap: StringMap = new (this.jamiSwig as any).StringMap();
+    const detailsStringMap: StringMap = new this.jamiSwig.StringMap();
 
     detailsStringMap.set('Account.type', 'RING');
     for (const [key, value] of details.entries()) {