Utils: Fix setting of minimal height of InfoLabels in QFormLayout

Calling setMinimumHeight is not compatible with QFormLayout if the label
has multiple lines. Overriding minimumSizeHint on the other hand is.

Change-Id: Id2167b295620322cec75035d7cc7125cc3221c4d
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/libs/utils/infolabel.h

@@ -51,6 +51,7 @@ public:
     void setType(InfoType type);
     bool filled() const;
     void setFilled(bool filled);
+    QSize minimumSizeHint() const override;
 
 protected:
     void paintEvent(QPaintEvent *event) override;