graphics/nvidia-drm-kmod: Fix fetch

After e97a9e1, graphics/nvidia-drm-515-kmod no longer fetches
because PORTREVISION was added to the Makefile. Since NVIDIA_GH_TAGNAME
was being derived from PKGNAME, adding PORTREVISION inadvertently
changed GH_TAGNAME for the port, therefore it did not match distinfo.

=> amshafer-nvidia-driver-535.104.05-nvidia-drm-515-kmod-535.104.05_1_GH0.tar.gz is not in /usr/ports/graphics/nvidia-drm-515-kmod/distinfo.
=> Either /usr/ports/graphics/nvidia-drm-515-kmod/distinfo is out of date, or
=> amshafer-nvidia-driver-535.104.05-nvidia-drm-515-kmod-535.104.05_1_GH0.tar.gz is spelled incorrectly.
*** Error code 1

Approved by:	portmgr (blanket)
MFH:		2023Q4

graphics/nvidia-drm-kmod/Makefile.common

@@ -15,7 +15,7 @@ RUN_DEPENDS+=	${KMODDIR}/nvidia.ko:x11/nvidia-driver
 
 LICENSE_FILE=	${WRKSRC}/nvidia/doc/license.txt
 
-NVIDIA_GH_TAGNAME=	${PKGNAME}
+NVIDIA_GH_TAGNAME=	${PORTNAME}-${DISTVERSION}
 USE_GITHUB=	yes
 GH_ACCOUNT=	amshafer freebsd:drm
 GH_PROJECT=	nvidia-driver drm-kmod:drm