CHUI-779 FIXED Chat log preferences are disabled before login.

indra/newview/llfloaterpreference.cpp

@@ -1491,6 +1491,7 @@ void LLFloaterPreference::setPersonalInfo(const std::string& visibility, bool im
 	getChildView("favorites_on_login_check")->setEnabled(TRUE);
 	getChildView("log_path_string")->setEnabled(FALSE);// LineEditor becomes readonly in this case.
 	getChildView("log_path_button")->setEnabled(TRUE);
+	getChildView("chat_font_size")->setEnabled(TRUE);
 }
 
 void LLFloaterPreference::onUpdateSliderText(LLUICtrl* ctrl, const LLSD& name)

indra/newview/skins/default/xui/en/panel_preferences_chat.xml

@@ -373,6 +373,7 @@
     </text>
 
     <combo_box
+        enabled="false"
         control_name="KeepConversationLogTranscripts"
         height="23"
         layout="topleft"
@@ -428,6 +429,7 @@
     </text>
   
     <line_editor
+    	enabled="false"
         control_name="InstantMessageLogPath"
         border_style="line"
         border_thickness="1"