Moved jobpost reporting POST part to a separate view

[iambibhas]

Fixes #291.

• removed POST handling part of jobpost reporting to a separate view.

[iambibhas]

@jace looks like only the reportform's POST part was being handled in jobdetail view. For GET requests, the view is just creating the reportform, rejectform and moderateform. Their POST requests are being handled in separate views already.

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