Surface: use rect selection state when setting selection on release

Looks like 52354b8 missed noting the outgoing screen selection state's
rectangle flag when setting the selection on mouse release, this was
causing the selection that was actually set to be
standard/wrap-selected. This corrects that by just shipping said flag
when calling setSelection.

src/Surface.zig

@@ -3341,7 +3341,7 @@ pub fn mouseButtonCallback(
                 try self.setSelection(terminal.Selection.init(
                     prev.start(),
                     prev.end(),
-                    false,
+                    prev.rectangle,
                 ));
             }
         }