ui: Fixes for code view

* set code font size as pixel value
* properly hide line number area for overview stats in both snippets and single file view
* fixed file title disabled for files in single file view in trial mode

src/lib_gui/qt/element/QtCodeField.cpp

@@ -63,7 +63,9 @@ QtCodeField::QtCodeField(
 	m_highlighter->highlightDocument();
 
 	ApplicationSettings* appSettings = ApplicationSettings::getInstance().get();
-	setFont(QFont(appSettings->getFontName().c_str(), appSettings->getFontSize()));
+	QFont font(appSettings->getFontName().c_str());
+	font.setPixelSize(appSettings->getFontSize());
+	setFont(font);
 	setTabStopWidth(appSettings->getCodeTabWidth() * fontMetrics().width('9'));
 }