containments/panel: fix Layout binding in `appletContainerComponent`
lastSpacer is still required because depending on
implicitWidth/implicitHeight is not reliable as they are usually updated
too late in a layout.
BUG: 454095 BUG: 454517 FIXED-IN: 5.25
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Before
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After:
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With Layout fix and without lastSpacer:
Edited by Fushan Wen