C++ indenter: Fix indentation after namespace aliases.

Task-number: QTCREATORBUG-2574
Reviewed-by: Roberto Raggi

src/plugins/cpptools/cppcodeformatter.cpp

@@ -93,6 +93,7 @@ void CodeFormatter::recalculateStateAfter(const QTextBlock &block)
         case namespace_start:
             switch (kind) {
             case T_LBRACE:      enter(namespace_open); break;
+            case T_SEMICOLON:
             case T_RBRACE:      leave(); break;
             } break;