[fix][query] Correct query server legacy condition (jaegertracing#6120)

## Which problem is this PR solving?
- Towards jaegertracing#6026 

## Description of the changes
- Fixes an issue from jaegertracing#6055
where the condition for routing to the legacy implementation was
accidentally flipped.

## How was this change tested?
- CI

## Checklist
- [x] I have read
https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
- [x] I have signed all commits
- [x] I have added unit tests for the new functionality
- [x] I have run lint and test steps successfully
  - for `jaeger`: `make lint test`
  - for `jaeger-ui`: `yarn lint` and `yarn test`

Signed-off-by: Mahad Zaryab <mahadzaryab1@gmail.com>

cmd/query/app/server.go

@@ -82,7 +82,7 @@ func NewServer(
 	}
 
 	var grpcServer *grpc.Server
-	if separatePorts {
+	if !separatePorts {
 		grpcServer, err = createGRPCServerLegacy(ctx, options, tm)
 	} else {
 		grpcServer, err = createGRPCServerOTEL(ctx, options, tm, telset)