chore: Fix unstable version setting

Author: twpol

Build.cmd

@@ -87,7 +87,7 @@ IF "%Mode%" == "Stable" (
 )
 
 REM Get product version and code revision.
-FOR /F "usebackq tokens=1* delims==" %%A IN (`CALL GetVersion.cmd`) DO SET %%A=%%B
+FOR /F "usebackq tokens=1* delims==" %%A IN (`CALL GetVersion.cmd %Mode%`) DO SET %%A=%%B
 SET Version=%OpenRails_Version%
 SET Revision=%OpenRails_Revision%
 

GetVersion.cmd

@@ -4,12 +4,11 @@ SETLOCAL ENABLEEXTENSIONS ENABLEDELAYEDEXPANSION
 REM Get product version and code revision.
 SET Version=
 SET Revision=
-FOR /F "usebackq tokens=2" %%B IN (`git branch --points-at HEAD`) DO SET Branch=%%B
 FOR /F "usebackq tokens=1* delims=-" %%V IN (`git describe --first-parent --always --long`) DO (
 	SET Version=%%V
 	SET Revision=%%W
 )
-IF "%Branch%" == "unstable" (
+IF "%~1%" == "Unstable" (
 	SET TZ=UTC
 	FOR /F "usebackq tokens=1* delims=-" %%V IN (`git log -1 --pretty^=format:^%%ad --date^=format-local:^%%Y^.%%m^.%%d-^%%H^%%M`) DO (
 		SET Version=%%V
@@ -21,6 +20,5 @@ IF "%Version%" == "" (
 )
 
 REM Output version numbers.
-ECHO OpenRails_Branch=%Branch%
 ECHO OpenRails_Version=%Version%
 ECHO OpenRails_Revision=%Revision%