Fix covered-switch-default warning in FormatManager.

[brucem]

Summary

The default case doesn't need to be here as the switch covers
all possible values. If there's a new "lazy bool" value added
in the future, the compiler would start to warn about the new
case not being covered.

[granata.enrico]

LGTM

source/DataFormatters/FormatManager.cpp

FormatManager::ShouldPrintAsOneLiner (ValueObject& valobj)
     {
         switch (compiler_type.ShouldPrintAsOneLiner())
         {
             case eLazyBoolNo:
                 return false;
             case eLazyBoolYes:
                 return true;
             case eLazyBoolCalculate:
-            default:
                 break;
         }
     }
     
     size_t total_children_name_len = 0;
     
     for (size_t idx = 0;
          idx < valobj.GetNumChildren();