Custom panel actors completely overwrite the actors object.

[luce80]

Describe the bug
Custom panel actors completely overwrite the actors object.

To reproduce

system/view/VID/styles/test-panel: [
	default-actor: on-down
	template: [
		type: 'panel
		size: 200x200
		actors: [
			test-func: func [a b][]
		]
	]
	init: [
		?? actors
		actors/test-func 1 2
	]
]
view [test-panel [button "test"] on-created [print "created"]]

Expected behavior
Custom actor functions should overwrite ONLY an already existing function with the same name.

Platform version

-----------RED & PLATFORM VERSION----------- 
RED: [ branch: "master" tag: #v0.6.5 ahead: 32 date: 16-Mar-2024/20:36:50 commit: #181d7faeab0381d7a86575847918a4ab05e68503 ]
PLATFORM: [ name: "Windows 11" OS: 'Windows arch: 'x86-64 version: 10.0.0 build: 22631 ]
--------------------------------------------

[gurzgri]

Sounds like we've been there before with issue #3392.

[hiiamboris]

with the only difference that that was an inline VID style and this is a template

[luce80]

A template of a panel. A template of something else works.

[greggirwin]

https://github.com/red/red/blob/master/modules/view/VID.red#L819