qml | Fix pragma reformatting

After this change reformatter test (tests/auto/qml/reformatter/tst_reformatter)
starts to work correctly for singleton example (qmlsingleton.qml)
NOTE: Just cherry-picking change from master branch.

Change-Id: Ia0561aa8b920fc5c62a8dea93341721f37b68dd8
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
(cherry picked from commit 749eaaad81)
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/qmljs/qmljsreformatter.cpp

@@ -537,6 +537,8 @@ protected:
     bool visit(UiPragma *ast) override
     {
         out("pragma ", ast->pragmaToken);
+        out(ast->name.toString());
+        newLine();
         return false;
     }