Added default value to m_fontSize.

Moved default value of m_fontSize out of random() to ensure that the font size isn't always reset each time that function is called.

src/kontrast.cpp

@@ -225,7 +225,6 @@ qreal Kontrast::contrast() const
 
 void Kontrast::random()
 {
-    m_fontSize = 12;
     do {
         m_textColor = QColor::fromRgb(QRandomGenerator::global()->generate());
         m_backgroundColor = QColor::fromRgb(QRandomGenerator::global()->generate());

src/kontrast.h

@@ -123,7 +123,7 @@ private:
     QColor m_textColor;
     QColor m_backgroundColor;
     QColor m_grabbedColor;
-    int m_fontSize;
+    int m_fontSize = 12;
     KAboutData m_about;
 
     ContrastQualities getContrastQualities();