Fix Invalid multi-line string on line 13

[callmefish]

For Terraform V1.3.~, pervious output.tf file will show the following error message after execute terraform apply.

Invalid multi-line string: Quoted strings may not be split over multiple lines. To produce a multi-line string, either use the \n escape to represent a newline character or use the "heredoc" multi-line template syntax.

One solution is to use %{if <BOOL>}/%{else}/%{endif} directive instead of conditional operator. And it may be more readable.

[hashicorp-cla]

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