Undo the fix provided for converting Rx to Gx Flow Description (#452)
Undo the fix provided for converting Rx to Gx Flow Description (#452)

The fix introduced in commit 768e4d9eb3241b0c817b13a78a54f790f952e104 is wrong, which resulting in UE
replying with bad Semantic error for Activate Dedicated EPS Bearer Context Request. Hence, reverting back
to original implementation as its correctly doing the conversion as per 3GPP Spec. ETSI ETSI TS 129 214 V14.3.0
Section 5.3.8.
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