Put Postgres explain back to default format text for now

Author: rbygrave

ebean-core/src/main/java/io/ebeaninternal/server/core/InternalConfiguration.java

@@ -598,7 +598,7 @@ QueryPlanLogger queryPlanLogger(Platform platform, DatabaseBuilder.Settings conf
       case ORACLE:
         return new QueryPlanLoggerOracle();
       case POSTGRES:
-        return new QueryPlanLoggerExplain(explain(config, "explain (analyze, costs, verbose, buffers, format json) "));
+        return new QueryPlanLoggerExplain(explain(config, "explain (analyze, costs, verbose, buffers) "));
       case YUGABYTE:
         return new QueryPlanLoggerExplain(explain(config,"explain (analyze, buffers, dist) "));
       default: