samples: modules: canopennode: set bootloader in sample.yaml

Set the bootloader choice for the
sample.modules.canopennode.program_download test case in the sample.yaml
file instead of sysbuild.conf. The reason for this change is to avoid
building MCUboot by default when using the --sysbuild option, as it may
not be compatible with all platforms. This is currently causing issues
on platforms like nRF54H20 where sysbuild is always used.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

samples/modules/canopennode/sample.yaml

@@ -24,6 +24,9 @@ tests:
       - twr_ke18f
     integration_platforms:
       - frdm_k64f
-    extra_args: canopennode_CONF_FILE=prj_img_mgmt.conf
+    extra_args:
+      canopennode_CONF_FILE=prj_img_mgmt.conf
+      SB_CONFIG_BOOTLOADER_MCUBOOT=y
+
   sample.modules.canopennode.no_storage:
     extra_args: CONF_FILE=prj_no_storage.conf

samples/modules/canopennode/sysbuild.conf

@@ -1 +0,0 @@
-SB_CONFIG_BOOTLOADER_MCUBOOT=y