Fix a crash with a long text.

At the moment the scroll_label is the label to be used if wrapping is
required.  The dialog looks a bit ugly due to the fact that the
scroll_label can't optimize it's size yet. Also the alignment looks a
bit odd, but I'll leave it to Baufo to tune that part.

data/gui/default/window/mp_login.cfg

@@ -44,12 +44,12 @@
 					border = "all"
 					border_size = 5
 					horizontal_alignment = "left"
-					[label]
+					[scroll_label]
 						id = "login_label"
 						definition = "default"
 
 						label = ""
-					[/label]
+					[/scroll_label]
 
 				[/column]
 

src/gui/dialogs/mp_connect.cpp

@@ -23,6 +23,7 @@
 #include "gui/widgets/listbox.hpp"
 #include "gui/widgets/label.hpp"
 #include "gui/widgets/password_box.hpp"
+#include "gui/widgets/scroll_label.hpp"
 #include "gui/widgets/toggle_button.hpp"
 
 namespace gui2 {
@@ -234,8 +235,10 @@ void tmp_login::pre_show(CVideo& /*video*/, twindow& window)
 		dynamic_cast<tbutton*>(window.find_widget("change_username", false));
     if(change_username) change_username->set_retval(2);
 
-	tlabel* label =
-		dynamic_cast<tlabel*>(window.find_widget("login_label", false));
+	// Needs to be a scroll_label since the text can get long and a normal label
+	// can't wrap (at the moment).
+	tcontrol* label =
+		dynamic_cast<tscroll_label*>(window.find_widget("login_label", false));
 	if(label) label->set_label(label_);
 
 	ttoggle_button* remember_password