remove unnecessary this

Co-authored-by: Alexander Grund <Flamefire@users.noreply.github.com>

Author: Noseey

libs/s25main/buildings/noBuildingSite.cpp

@@ -149,7 +149,7 @@ void noBuildingSite::OrderConstructionMaterial()
         return;
 
     // Optimization: return early if building is isolated
-    if(!this->IsConnected())
+    if(!IsConnected())
         return;
 
     // Bretter