SQL data sources: Fix configuration UI (#33110)

* fix frontend mssql/postgres

* fix frontend

Co-authored-by: Ying WANG <ying.wang@grafana.com>

public/app/plugins/datasource/mssql/config_ctrl.ts

@@ -16,6 +16,7 @@ export class MssqlConfigCtrl {
 
   /** @ngInject */
   constructor($scope: any) {
+    this.current = $scope.ctrl.current;
     this.current.jsonData.encrypt = this.current.jsonData.encrypt || 'false';
     this.current.jsonData.authenticationType = this.current.jsonData.authenticationType || 'SQL Server Authentication';
     this.onPasswordReset = createResetHandler(this, PasswordFieldEnum.Password);

public/app/plugins/datasource/postgres/config_ctrl.ts

@@ -19,6 +19,7 @@ export class PostgresConfigCtrl {
 
   /** @ngInject */
   constructor($scope: any, datasourceSrv: DatasourceSrv) {
+    this.current = $scope.ctrl.current;
     this.datasourceSrv = datasourceSrv;
     this.current.jsonData.sslmode = this.current.jsonData.sslmode || 'verify-full';
     this.current.jsonData.tlsConfigurationMethod = this.current.jsonData.tlsConfigurationMethod || 'file-path';