Corrected Concentration's status icon (#3647)

Corrected Lord Knight's Concentration status icon displaying the wrong one.

Thanks to @mrjnumber1!

src/map/status.cpp

@@ -416,7 +416,7 @@ void initChangeTables(void)
 	add_sc( NPC_INVISIBLE		, SC_CLOAKING		);
 	set_sc( LK_AURABLADE		, SC_AURABLADE		, EFST_AURABLADE		, SCB_NONE );
 	set_sc( LK_PARRYING		, SC_PARRYING		, EFST_PARRYING		, SCB_NONE );
-	set_sc( LK_CONCENTRATION	, SC_CONCENTRATION	, EFST_CONCENTRATION	,
+	set_sc( LK_CONCENTRATION	, SC_CONCENTRATION	, EFST_LKCONCENTRATION	,
 #ifndef RENEWAL
 		SCB_BATK|SCB_WATK|SCB_HIT|SCB_DEF|SCB_DEF2 );
 #else