Update tools_screens.py

Missed import sentence for commands on last commit

src/seedsigner/gui/screens/tools_screens.py

@@ -9,6 +9,7 @@
 from seedsigner.gui.screens.screen import RET_CODE__BACK_BUTTON, BaseScreen, ButtonListScreen, KeyboardScreen
 from seedsigner.hardware.buttons import HardwareButtonsConstants
 from seedsigner.models.settings_definition import SettingsConstants, SettingsDefinition
+from seedsigner.gui.keyboard import Keyboard