Allow the password manager to open as a sheet even if another sheet is already open. Issue 5667.

sources/PseudoTerminal.m

@@ -4735,11 +4735,6 @@ ITERM_WEAKLY_REFERENCEABLE
                                inSession:(PTYSession *)session {
     DLog(@"openPasswordManagerToAccountName:%@ inSession:%@", name, session);
     [session reveal];
-    if (self.window.sheets.count > 0) {
-        DLog(@"This window has sheets so not opening pw manager: %@", self.window.sheets);
-        DLog(@"The last sheet's view hierarchy:\n%@", [[[self.window.sheets lastObject] contentView] iterm_recursiveDescription]);
-        return;
-    }
     DLog(@"Show the password manager as a sheet");
     iTermPasswordManagerWindowController *passwordManagerWindowController =
         [[iTermPasswordManagerWindowController alloc] init];