fix: login to current versions of Fineract API (#742)

Refer https://issues.apache.org/jira/browse/FINERACT-726

Fixes: #741

src/app/core/authentication/authentication.service.ts

@@ -88,10 +88,8 @@ export class AuthenticationService {
     this.rememberMe = loginContext.remember;
     this.storage = this.rememberMe ? localStorage : sessionStorage;
 
-    let httpParams = new HttpParams();
-    httpParams = httpParams.set('username', loginContext.username);
-    httpParams = httpParams.set('password', loginContext.password);
     if (environment.oauth.enabled) {
+      let httpParams = new HttpParams();
       httpParams = httpParams.set('client_id', 'community-app');
       httpParams = httpParams.set('grant_type', 'password');
       httpParams = httpParams.set('client_secret', '123');
@@ -103,7 +101,7 @@ export class AuthenticationService {
           })
         );
     } else {
-      return this.http.post('/authentication', {}, { params: httpParams })
+      return this.http.post('/authentication', { username: loginContext.username, password: loginContext.password })
         .pipe(
           map((credentials: Credentials) => {
             this.onLoginSuccess(credentials);