[lldb][progress] Fix format string in title (#8314)

The title string for the progress report for loading Swift module
dependencies had an unused formatter in its title string. Since the
filename that was supposed to go in this formatter will now be reported
as a detail, this commit removes the formatter from the title string.

Author: chelcassanova

lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp

@@ -4273,7 +4273,7 @@ void SwiftASTContext::ValidateSectionModules(
 
   Status error;
 
-  Progress progress("Loading Swift module '{0}' dependencies",
+  Progress progress("Loading Swift module dependencies",
                     module.GetFileSpec().GetFilename().AsCString(),
                     module_names.size());
   size_t completion = 0;