[GHC] #8076: `prompt2` not honoured in `:set +m`-style continuations

[GHC]

#8076: `prompt2` not honoured in `:set +m`-style continuations
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       Reporter:  hvr               |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  GHCi              |           Version:  7.7
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 When the continuation prompt became customizable via
 bc44435dc2f6cda1071c68b79ace5b390a89244c adapting the prompt for the `:set
 +m`-style continuation was missed, leaving it hardcoded to `"%s| "`.

 This is already mentioned in ticket:8051#comment:1, but to make sure this
 isn't lost, I've created this separate ticket.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8076>
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