Combined MapOpenAPI and MapScalar in same env condition

Line 501, moved app.MapOpenAPI() to same environment condition block for app.MapScalarApiReference()

Author: wadepickett

aspnetcore/fundamentals/openapi/samples/9.x/WebMinOpenApi/Program.cs

@@ -386,10 +386,6 @@ public class Body {
 if (app.Environment.IsDevelopment())
 {
     app.MapOpenApi();
-}
-
-if (app.Environment.IsDevelopment())
-{
     app.MapScalarApiReference();
 }