Select widget items not displayed on full screen when embedded on expansion panel

[dfguerrerom]

Describe the bug
Similar as widgetti/ipyvuetify#141, Select items are not displayed on the latest FullScreen implementation of sepal_ui when the element is embedded on an ExpansionPanel.

To Reproduce

from ipyleaflet import WidgetControl
import ipyvuetify as v
from sepal_ui.mapping import SepalMap, FullScreenControl

expansion = v.ExpansionPanels(
    children=[
        v.ExpansionPanel(
            children=[
                v.ExpansionPanelHeader(children=["header"]),
                v.ExpansionPanelContent(children=[
                    v.Select(items=[f"{i}" for i in range(10)])
                ])
            ]
        )
    ]
)

map_=SepalMap()
map_.add_control(
    FullScreenControl(map_, position="topleft", fullscreen=True, fullapp=True)
)
control = WidgetControl(widget=expansion)
map_.add_control(control)
map_

Expected behavior
Just display items as you would expect without full screen