remove "U" button when unfloating views

[Andreas Rabe]

Given two map views with enmap_berlin.bsq:

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When floating Map #1, a new “U” button appears in both views:

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It’s unclear why I need the “U” buttons?

When clicking the “U” button in Map #2…

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… both “U” buttons disappear:

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I guess we can just delete the “U”! buttons.

Or what are they supposed to do?

[Andreas Rabe]

Note that after unfloating the floating view…

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… the “U” buttons also disappear.

[Benjamin Jakimow]

“U” for unfloat = bring back to main EnMAP-Box DockArea

[Benjamin Jakimow]

fixed floating/unfloating of docks (resolves #1231)

Signed-off-by: jakimowb [e-mail]

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