Remove leftover import

...from 1b4c0940 "uitest Calc/Goal seek;
tdf#37341 ; tdf#43693"

Change-Id: I7c346311c975709e71ca332a8894e6df7a745ab6
Reviewed-on: https://gerrit.libreoffice.org/56588
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

sc/qa/uitest/solver/solver.py

@@ -10,7 +10,6 @@ from uitest.uihelper.common import select_pos
 from uitest.uihelper.calc import enter_text_to_cell
 from libreoffice.calc.document import get_cell_by_position
 from libreoffice.uno.propertyvalue import mkPropertyValues
-from uitest.debug import sleep
 import org.libreoffice.unotest
 import pathlib