fix typo (#145)

Author: d-trace

hypertrace-graphql-explorer-schema/src/main/java/org/hypertrace/graphql/explorer/dao/GatewayServiceExploreRequestBuilder.java

@@ -79,7 +79,7 @@ Single<org.hypertrace.gateway.service.v1.explore.ExploreRequest> buildRequest(
               .ifPresent(
                   timeRangeArgument -> {
                     builder.setStartTimeMillis(timeRangeArgument.startTime().toEpochMilli());
-                    builder.setEndTimeMillis(timeRangeArgument.startTime().toEpochMilli());
+                    builder.setEndTimeMillis(timeRangeArgument.endTime().toEpochMilli());
                   });
 
           return builder.build();