Fix Natvis for DisplayString conditionals in C
Fix Natvis for DisplayString conditionals in C

Issue: gdb returns "1" and "0" instead of "true" and "false" when
debugging C and a condition is passed for evaluation.

Changed code to check for either "true" or "1"

Microsoft/MIEngine,chuckries/MIEngine,csiusers/MIEngine,chuckries/MIEngine,chuckries/MIEngine,pieandcakes/MIEngine,Microsoft/MIEngine,pieandcakes/MIEngine,orbitcowboy/MIEngine,pieandcakes/MIEngine,Microsoft/MIEngine,csiusers/MIEngine,pieandcakes/MIEngine,orbitcowboy/MIEngine,orbitcowboy/MIEngine,Microsoft/MIEngine,chuckries/MIEngine,csiusers/MIEngine,orbitcowboy/MIEngine,csiusers/MIEngine