Revert "Fix plugins import in CuraApplication"

This reverts commit e87f3d7ca9cf135142bee488f188b9639c8b38fd.

cura/CuraApplication.py

@@ -82,6 +82,7 @@ from cura.Settings.SettingInheritanceManager import SettingInheritanceManager
 from cura.Settings.SimpleModeSettingsManager import SimpleModeSettingsManager
 
 from cura.Machines.VariantManager import VariantManager
+from plugins.SliceInfoPlugin.SliceInfo import SliceInfo
 
 from .SingleInstance import SingleInstance
 from .AutoSave import AutoSave
@@ -112,10 +113,6 @@ from cura.ObjectsModel import ObjectsModel
 from UM.FlameProfiler import pyqtSlot
 
 
-if TYPE_CHECKING:
-    from plugins.SliceInfoPlugin.SliceInfo import SliceInfo
-
-
 numpy.seterr(all = "ignore")
 
 try: