Add suppressions in cfg tests

Author: ludviggunne

test/cfg/qt.cpp

@@ -723,6 +723,7 @@ namespace {
     private:
         int m_value;
     };
+    // cppcheck-suppress shadowFunction
     void Counter1::setValue(int value) {
         if (value != m_value) {
             m_value = value;
@@ -746,6 +747,7 @@ namespace {
     private:
         int m_value;
     };
+    // cppcheck-suppress shadowFunction
     void Counter2::setValue(int value) {
         if (value != m_value) {
             m_value = value;