[VIM-2255] Missing reload icon in .ideavimrc on Windows

[chylex]

https://youtrack.jetbrains.com/issue/VIM-2255

Due to:

  fun saveFileState(filePath: String, text: String) {
    this.filePath = FileUtil.toSystemDependentName(filePath)
    // ....
  }

the path never matches, since on Windows, virtualFile.path has forward slashes and VimRcFileState.filePath has backslashes.

[chylex]

I also noticed another issue that happens on all operating systems - the reload button doesn't appear if .ideavimrc is opened as IJ is starting (for ex. if you open the file and then restart IJ), as VimRcFileState.filePath is not initialized this early so the comparison also fails.

[AlexPl292]

Hi, thank you for the reload action reviewing. I've merged your changes and added a fix for the button when IJ starts with ideavimrc.