Fix external gateway check

Author: msm1992

components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/notifier/ExternalGatewayNotifier.java

@@ -167,7 +167,7 @@ private boolean isExternalGatewayAvailableToDeployment(DeployAPIInGatewayEvent d
             Map<String, Environment> environments = APIUtil.getEnvironments(deployAPIInGatewayEvent.getTenantDomain());
             for (String label : gatewayLabels) {
                 Environment environment = environments.get(label);
-                if (environment != null && !APIConstants.WSO2_GATEWAY_ENVIRONMENT.equals(environment.getGatewayType())) {
+                if (environment != null && !APIConstants.WSO2_GATEWAY_ENVIRONMENT.equals(environment.getProvider())) {
                     return true;
                 }
             }

components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/utils/APIUtil.java

@@ -10407,7 +10407,7 @@ public static boolean isAnyExternalGateWayProviderExists(String tenantDomain) {
         try {
             Map<String, Environment> environments = getEnvironments(tenantDomain);
             for (Environment environment : environments.values()) {
-                if (!APIConstants.WSO2_GATEWAY_ENVIRONMENT.equals(environment.getGatewayType())) {
+                if (!APIConstants.WSO2_GATEWAY_ENVIRONMENT.equals(environment.getProvider())) {
                     return true;
                 }
             }