[FIX] Sequence copyReplaceAll fix

[Bill Sun]

Fix plus unit test for the copyReplaceAll:with: method
in sequence.slate.

Before:
==========
Slate 1> addSlot: #s.
lobby
Slate 2> s: 'slate'.
'slate'
Slate 3> s copyReplaceAll: 's' with: 'S'.
'slate'
==========

After:
==========
Slate 7> s copyReplaceAll: 's' with: 'S'.
'Slate'
==========

-Bill


		
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