SHOT-2756: Fix panel dialog title when not docked

[staceyoue]

This change only affeects DCCs that do not have the ability to dock the panel app (e.g. uses show_dialog instead of show_panel).

So for example:

• In Maya, the panel title will remain ShotGrid
• In Alias (where we cannot dock the panel), the title will now be ShotGrid: Panel instead of ShotGrid: ShotGrid

[codecov[bot]]

Codecov Report

Merging #56 (352bf0b) into master (56cbd5b) will not change coverage. The diff coverage is 0.00%.

:exclamation: Current head 352bf0b differs from pull request most recent head 9b41122. Consider uploading reports for the commit 9b41122 to get more accurate results

@@           Coverage Diff           @@
##           master      #56   +/-   ##
=======================================
  Coverage   76.13%   76.13%           
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  Files          34       34           
  Lines        2422     2422           
=======================================
  Hits         1844     1844           
  Misses        578      578           

Impacted Files	Coverage Δ
app.py	48.61% <0.00%> (ø)

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