CComponentsHeader/CComponentsFooter: prevent crash on changed font settings

Default fonts for header and footer must be handled too.
After font settings changes these objects could be invalid.
Default fonts have invalid pointers after font changes too. Extra reset is required.

src/gui/components/cc_frm_header.h

@@ -102,6 +102,8 @@ class CComponentsHeader : public CComponentsForm, public CCTextScreen
 
 		///init font object and recalculates height if required
 		void initCaptionFont();
+		///init default fonts for size modes
+		virtual void initDefaultFonts();
 		///sub: init icon object
 		void initIcon();
 		///sub: init caption object