fix: Inverted conditional for bus creation

[seanmann-synth]

Description

While attempting to prevent the creation of the event bus I noticed that despite setting create and create_bus false that the module was still complaining that it couldn't find the event bus resource.

* Failed to execute "terraform apply" in ./.terragrunt-cache/8HF66hbAsRFOCc5OnnuLt3r_uyU/XdD3lc4frNDv5mvmMn0J_6eJy-Y
  ╷
  │ Error: reading EventBridge Event Bus (scheduled-lambda-bus-template-lambda-dev): couldn't find resource
  │ 
  │   with module.eventbridge.data.aws_cloudwatch_event_bus.this[0],
  │   on .terraform/modules/eventbridge/main.tf line 58, in data "aws_cloudwatch_event_bus" "this":
  │   58: data "aws_cloudwatch_event_bus" "this" {
  │ 
  ╵
  
  exit status 1

It seems the conditional expression is inverted. This PR fixes that.

Motivation and Context

Fixes create and create_bus flag behavior to be as expected (e.g., if false then don't make the bus).

Breaking Changes

No expected breaking changes.

How Has This Been Tested?

Ultra minor change. Please verify logic and merge.

[github-actions]

This PR has been automatically marked as stale because it has been open 30 days
with no activity. Remove stale label or comment or this PR will be closed in 10 days

[bryantbiggs]

this is correct as written - if var.create is true and var.create_bus is false, then the data source will be used to look up an externally created (existing) event bus

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues. If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.