Fix an obvious bug in StandardStack implementation

Description

As you can see, new node is pushed at the beginning of the linked list, so 'getPrevious()' implementation is wrong. We simply return `internalStack.get( 1 )` (current node corresponds to index of 0).
However, this method has never been used. Also, it has been fixed in v6 for its implementation has been totally changed.

Environment

None

Assignee

Nathan Xu

Reporter

Nathan Xu

Fix versions

Labels

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backPortable

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Suitable for new contributors

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Requires Release Note

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backportDecision

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Components

Affects versions

Priority

Trivial
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