Fix GUI-Test project configuration

So that Release-GUI can build
#262 
I believe this is the one that caused the "Cannot You-DataStore.lib" error because You-DataStore is in additional library dependencies on this project, not sure why.

https://github.com/cs2103aug2014-w10-1c/main/blob/master/You-GUI-Tests/You-GUI-Tests.vcxproj#L91