install.cmd fails if 2 versions of gimp are installed

[0reo]

Describe the bug As the title states, if you try to run the install script with more than 1 version of gimp installed, it will fail. Seems to be because of line 26/27 in install.cmd https://github.com/UserUnknownFactor/GIMP3-ML/blob/df66bb11f44ac5c39d7bea63774b8fa7611204a9/install.cmd#L26-L27 $gimpdir will have 2 paths, and so $gimp won't work

To Reproduce Steps to reproduce the behavior:

1. Have 2 versions of Gimp installed(Say, a stable 2.10 build, and 2.99.16)
2. run install script
3. See error

   
   dir : Cannot find path 'C:\Program Files\GIMP 2 C:\Program Files\GIMP 2.99\bin' because it does not exist.
   At line:26 char:10
   + $gimp = (dir  "$($gimpdir)\bin\gimp-console-*.exe").FullName
   +          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   + CategoryInfo          : ObjectNotFound: (C:\Program File...s\GIMP 2.99\bin:String) [Get-ChildItem], ItemNotFoundException
   + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetChildItemCommand

Could not find GIMP! You will have to add '$($PSScriptRoot)\plugins' to Preferences -> Folders -> Plug-ins manually. At line:28 char:5

• throw "Could not find GIMP! You will have to add '$pluginsDir' to ...

• 
  + CategoryInfo          : OperationStopped: (Could not find ...g-ins manually.:String) [], RuntimeException
  + FullyQualifiedErrorId : Could not find GIMP! You will have to add '$($PSScriptRoot)\plugins' to Preferences -> Folders -> Plug-ins manually.
  ```

Desktop (please complete the following information):

• OS Version: Windows 10
• GIMP Version: 2.99.10 and any other version

[UserUnknownFactor]

Feel free to create a pull request if you have an idea how to fix it. Maybe expand the search name from GIMP* to GIMP 2.9*...