"Unknown counter tag" messages in 2.3.x when exported from master

[Richard Kimberly Heck]

On 9/6/20 11:39 PM, Scott Kostyshak wrote:
> If I export the attached file to 2.3.x, and I open the file in 2.3.x, I
> get many terminal messages like the below ones:
>
>   LyX: Unknown counter tag `GuiName' [around line 29 of file [layouts/theorems-ams-chap-bytype.inc] current token: 'GuiName' context: '']
>   LyX: Unknown counter tag `Theorem' [around line 30 of file [layouts/theorems-ams-chap-bytype.inc] current token: 'Theorem' context: '']
>   LyX: Unknown counter tag `GuiName' [around line 33 of file [layouts/theorems-ams-chap-bytype.inc] current token: 'GuiName' context: '']
>
> If I open the exported file in 2.3.0, I don't see terminal messages.

Fixed. (A cherry-pick wrongly brought this tag back into 2.3.x.)

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