fix tests

Author: Artem

redisinsight/api/test/api/instance/GET-instance-id-overview.test.ts

@@ -69,7 +69,7 @@ describe('GET /instance/:instanceId/overview', () => {
           expect(body.version).to.eql(rte.env.version);
           expect(body.cpuUsagePercentage).to.eql(undefined)
           expect(body.totalKeys).to.not.eql(undefined)
-          expect(body.totalKeysPerDb).to.not.eql(undefined)
+          expect(body.totalKeysPerDb).to.eql(undefined)
           expect(body.connectedClients).to.not.eql(undefined)
           expect(body.opsPerSecond).to.not.eql(undefined)
           expect(body.networkInKbps).to.not.eql(undefined)