[babel-plugin] Fix positionTry emitting every declaration twice

[lenamonj]

What changed / motivation ?

stylex.positionTry emitted every declaration twice, once with the property name as its own value, and produced an RTL variant for every rule. generateLtr and generateRtl take and return a [key, value] pair, but the code mapped only the value, so the returned pair was spliced in as the value: anchor-name:anchor-name;anchor-name:--myAnchor. The generators are now applied to the whole entry with objMapEntry, the same way the other transforms use them.

Linked PR/Issues

None.

Additional Context

The existing snapshots recorded the doubled output; they are updated to the corrected rules and the RTL variant is null where nothing flips.

Pre-flight checklist

• I have read the contributing guidelines
  Contribution Guidelines
• Performed a self-review of my code

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