[bug] Serial session cannot set caret style

[bug] 在"会话设置"中不能保存对“插入符样式”的选择，比如 从默认的“块”选择为“闪烁竖线”，完成选择、保存，然后再次打开会话设置并切换到“窗口”，这时“插入符样式”恢复到默认的“块”。

[question] 在上面所说的串口“会话设置”的“窗口”中，当设置“列(C)” 由默认的80设置为160时，在主窗口中并没有生效；即使重新打开会话。

Version: WindTerm_2.3.0_Windows_Portable_x86_64.zip
OS: Windows 7 旗舰版 SP1

Start in the serial session's 会话设置 window and reproduce both persistence problems described: caret style resets and the column width does not affect the main window after reopening. Trace how these settings are saved and restored; done means both selections persist and the configured width is reflected in the reopened session.

Written by the indexing model from the issue text.