ci: fix debian-build-testing BUILDTYPE

Fixes: 5b291c7ce6
Signed-off-by: Pavel Ondračka <pavel.ondracka@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33368>

.gitlab-ci/build/gitlab-ci.yml

@@ -238,7 +238,6 @@ debian-build-testing:
   extends: .meson-build
   stage: build-for-tests
   variables:
-    BUILDTYPE: debug
     UNWIND: "enabled"
     DRI_LOADERS: >
       -D glx=dri
@@ -255,7 +254,7 @@ debian-build-testing:
       -D gallium-rusticl=false
     GALLIUM_DRIVERS: "i915,iris,nouveau,r300,r600,freedreno,llvmpipe,softpipe,svga,v3d,vc4,virgl,etnaviv,panfrost,lima,zink,d3d12,asahi,crocus"
     VULKAN_DRIVERS: "intel_hasvk,imagination-experimental,microsoft-experimental,nouveau,swrast"
-    BUILD_TYPE: "debugoptimized"
+    BUILDTYPE: "debugoptimized"
     EXTRA_OPTION: >
       -D spirv-to-dxil=true
       -D osmesa=true