Fix Cancel command do not work on scripting

Before this fix, the 'Cancel' command did not work in the following
specific situation:
As soon as Aseprite was started and without hitting the 'Esc' key,
the 'app.command.Cancel()' command did not perform any operation.

It was discovered that the Cancel command is started only once per
session and retains the 'm_type' throughout the session. Only
a specific:
app.command.Cancel {type = "all"} or
app.command.Cancel {type = "noop"}
could change the command type.

src/app/commands/cmd_cancel.cpp

@@ -1,4 +1,5 @@
 // Aseprite
+// Copyright (C) 2024  Igara Studio S.A.
 // Copyright (C) 2001-2017  David Capello
 //
 // This program is distributed under the terms of
@@ -47,6 +48,8 @@ void CancelCommand::onLoadParams(const Params& params)
   std::string type = params.get("type");
   if (type == "noop") m_type = NoOp;
   else if (type == "all") m_type = All;
+  // TODO: add specific types for selection/ranges during scripting.
+  else m_type = All;
 }
 
 void CancelCommand::onExecute(Context* context)