qt: rm some usages of get_parent_main_window

instead, pass around the main window or config (whichever is actually needed)

fixes #6342

electrum/plugins/coldcard/qt.py

@@ -5,8 +5,9 @@ import copy
 from PyQt5.QtCore import Qt, pyqtSignal
 from PyQt5.QtWidgets import QPushButton, QLabel, QVBoxLayout, QWidget, QGridLayout
 
-from electrum.gui.qt.util import WindowModalDialog, CloseButton, get_parent_main_window, Buttons
+from electrum.gui.qt.util import WindowModalDialog, CloseButton, Buttons
 from electrum.gui.qt.transaction_dialog import TxDialog
+from electrum.gui.qt.main_window import ElectrumWindow
 
 from electrum.i18n import _
 from electrum.plugin import hook
@@ -92,7 +93,7 @@ class Coldcard_Handler(QtHandlerBase):
 
 class CKCCSettingsDialog(WindowModalDialog):
 
-    def __init__(self, window, plugin, keystore):
+    def __init__(self, window: ElectrumWindow, plugin, keystore):
         title = _("{} Settings").format(plugin.device)
         super(CKCCSettingsDialog, self).__init__(window, title)
         self.setMaximumWidth(540)
@@ -104,6 +105,8 @@ class CKCCSettingsDialog(WindowModalDialog):
         #handler = keystore.handler
         self.thread = thread = keystore.thread
         self.keystore = keystore
+        assert isinstance(window, ElectrumWindow), f"{type(window)}"
+        self.window = window
 
         def connect_and_doit():
             # Attempt connection to device, or raise.
@@ -188,7 +191,7 @@ class CKCCSettingsDialog(WindowModalDialog):
 
     def start_upgrade(self, client):
         # ask for a filename (must have already downloaded it)
-        mw = get_parent_main_window(self)
+        mw = self.window
         dev = client.dev
 
         fileName = mw.getOpenFileName("Select upgraded firmware file", "*.dfu")