Perma-diff on aws_opsworks_stack custom cookbooks source password

[apparentlymart]

In #6203 I tried to fix a perma-diff issue caused by Opsworks returning the password as literally "*****FILTERED*****".

However, that fix was not adequate: the function changed by that patch is building an entirely new custom cookbooks source structure, so now the password is being saved as the empty string. To get rid of this perma-diff we need to copy the old value into the new mapping before assigning the new mapping to the resource data.

[ghost]

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