[FIX][E] #1093 Correctly display path of existing resource for error

Adjusts the error message displayed in cases where the user chooses the
option to create a new directory as part of the resource negotiation
using values pointing to an already existing directory. The message used
the 'toString()' of the IContainer object which included a resource type
designation at the start of the path. To avoid confusion, the
OS-specific path of the resource is used instead.

Resolves #1093.

eclipse/src/saros/ui/widgets/wizard/ReferencePointOptionResult.java

@@ -293,7 +293,7 @@ private IContainer getNewDirectoryHandle(
       throw new IllegalInputException(
           MessageFormat.format(
               Messages.ReferencePointOptionResult_error_new_directory_already_exists,
-              containerToCreate));
+              containerToCreate.getFullPath().toOSString()));
     }
 
     return containerToCreate;