Add sensitive scaling for field item map

if ppl have something other than 100% scale somehow
Closes #248

NHSE.WinForms/Subforms/Map/FieldItemEditor.cs

@@ -32,9 +32,10 @@ public FieldItemEditor(MainSave sav)
             InitializeComponent();
             this.TranslateInterface(GameInfo.CurrentLanguage);
 
+            var scale = (PB_Acre.Width - 2) / 32;
             SAV = sav;
             Map = new MapManager(sav);
-            View = new MapViewer(Map);
+            View = new MapViewer(Map, scale);
 
             Loading = true;