[studio] Regression: Plan is missing install of hab-studio-profile.sh

[fnichol]

Refactorings in #4661 didn't update the Plan to account for new package files.

Stable behavior:

ubuntu@fnichol-cloudy-studio-2017-11> hab studio new
   hab-studio: Creating Studio at /hab/studios/home--ubuntu--habitat-sh (default)
   hab-studio: No secret keys imported! Did you mean to set HAB_ORIGIN?
To specify a HAB_ORIGIN, either set the HAB_ORIGIN environment
variable to your origin name or run 'hab setup' and specify a
default origin.
» Installing core/hab-backline/0.55.0 from channel 'stable'
☛ Verifying core/hab-backline/0.55.0/20180321222227
↓ Downloading core-20160810182414 public origin key
…
» Binlinking sh from core/bash into /hab/studios/home--ubuntu--habitat-sh/bin
★ Binlinked sh from core/bash/4.3.42/20170513213519 to /hab/studios/home--ubuntu--habitat-sh/bin/sh

Regressed behavior:

> env HAB_STUDIO_BACKLINE_PKG=core/hab-backline/0.55.0 hab studio new
   hab-studio: Creating Studio at /hab/studios/home--ubuntu--habitat-sh (default)
   hab-studio: No secret keys imported! Did you mean to set HAB_ORIGIN?
To specify a HAB_ORIGIN, either set the HAB_ORIGIN environment
variable to your origin name or run 'hab setup' and specify a
default origin.
» Installing core/hab-backline/0.55.0 from channel 'stable'
☛ Verifying core/hab-backline/0.55.0/20180321222227
↓ Downloading core-20160810182414 public origin key
    75 B / 75 B | 
…
» Binlinking sh from core/bash into /hab/studios/home--ubuntu--habitat-sh/bin
★ Binlinked sh from core/bash/4.3.42/20170513213519 to /hab/studios/home--ubuntu--habitat-sh/bin/sh
cat: can't open '/hab/pkgs/core/hab-studio/0.56.0-dev/20180329173156/libexec/hab-studio-profile.sh': No such file or directory