ADD: About dialog window MinWidth/MinHeight size (issue #450)

src/fAbout.lfm

@@ -7,6 +7,8 @@ object frmAbout: TfrmAbout
   Caption = 'About'
   ClientHeight = 400
   ClientWidth = 667
+  Constraints.MinHeight = 400
+  Constraints.MinWidth = 667
   KeyPreview = True
   OnKeyDown = FormKeyDown
   OnShow = frmAboutShow