VID actors creation doesn't merge in predefined actors from style

[gurzgri]

Expected behavior

VID face actors creation code should merge actors declared per face with actors predefined in the style of which the face is derived from.
This problem isn't restricted to the ON-TIME actor used in the example code below but happens to all actors declared for a style.

Actual behavior

VID face actors creation code only creates explicit actors and/or default actor, but doesn't merge in actors already defined for the style the face is generated from.

Steps to reproduce the problem

1. Run the following code:

layout [
    style clock: base rate 0:00:01 on-time [probe 'on-time]
    a-clock: clock
    b-clock: clock [probe 'on-down]
]
? a-clock/actors
? b-clock/actors 

2. See how the output

A-CLOCK/ACTORS is an object! with the following words and values:
     on-time  function!     [face [object!] event [event! none!]]
B-CLOCK/ACTORS is an object! with the following words and values:
     on-down  function!     [face [object!] event [event! none!]]
]

shows how B-CLOCK has been created without merging in ON-TIME actor from its style because of the explicit ON-DOWN actor.

3. Check how A-CLOCK declared without explicit actors keeps the ON-TIME actor.

Red and platform version

RED: [ branch: "master" tag: #v0.6.3 ahead: 712 date: 16-May-2018/9:52:18 commit: #1fd3e99c516a900d562ad9a7744e0c74b5e2613d ]
PLATFORM: [ name: "Windows 10" OS: 'Windows arch: 'x86-64 version: 10.0.0 build: 16299 ]