Debugger: Fix misplaced {

Harm was limited, as these were the fallback values for terminal
and working directory that are overridden in all cases with
real RunConfiguations.

Change-Id: I7d3cef1ac814a0ffcf60a8977e0ae13136ea50b5
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>