Fix scenario button saying there are no scenario installed even though there are the built-in ones

rsrc/dialogs/no-scenarios.xml

@@ -1,13 +0,0 @@
-<?xml version='1.0' encoding='UTF-8' standalone='no'?>
-<?xml-stylesheet href="dialog.xsl" type="text/xsl"?>
-<dialog defbtn='okay'>
-	<button name='okay' type='regular' top='80' left='359'>OK</button>
-	<pict type='dlog' num='16' top='6' left='6'/>
-	<text top='6' left='49' width='373' height='52'>
-		Blades of Exile currently has no scenarios installed.
-		To install a scenario, copy it (with extra graphics files, if any)
-		into the Scenarios folder, which may be found at the
-		following location:
-	</text>
-	<text name='path' top='60' left='6' width='416' height='16' framed='true'/>
-</dialog>

src/game/boe.dlgutil.cpp

@@ -1441,12 +1441,6 @@ public:
 		using namespace std::placeholders;
 		extern fs::path scenDir;
 		
-		if(scen_headers.empty()) { // TODO: Arrange this to be a check before calling run()
-			cChoiceDlog err("no-scenarios");
-			err->getControl("path").setText(scenDir.string());
-			err.show();
-			return scen_header_type();
-		}
 		set_cursor(sword_curs);
 		
 		me["cancel"].attachClickHandler(std::bind(&cChooseScenario::doCancel, this));