Remove is_beyond_limit check from AddressList to fix O(N²) hang

AddressList.on_update() calls wallet.is_beyond_limit(address, is_change)
for every address. That method does addr_list.index(address) which is
O(N) per call, making the overall loop O(N²). On a wallet with 137,776
addresses, this single check causes a ~12 second GUI freeze every time
the address list is rebuilt.

The check only colors rows red for addresses beyond the gap limit — a
minor visual indicator. Removing it eliminates the O(N²) cost entirely.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: JLMoriart

electroncash_gui/qt/address_list.py

@@ -242,8 +242,6 @@ def restore_expanded_items(root, expanded_item_names):
                 if self.wallet.is_frozen(address):
                     address_item.setBackground(0, ColorScheme.BLUE.as_color(True))
                     address_item.setToolTip(0, _("Address is frozen, right-click to unfreeze"))
-                if self.wallet.is_beyond_limit(address, is_change):
-                    address_item.setBackground(0, ColorScheme.RED.as_color(True))
                 if is_change and self.wallet.is_retired_change_addr(address):
                     address_item.setForeground(0, ColorScheme.GRAY.as_color())
                     old_tt = address_item.toolTip(0)