default to sda for mesh routers

src/freedombone-image

@@ -98,7 +98,7 @@ mesh_router_setup_script() {
     echo "DEFAULT_DOMAIN_NAME=${USERNAME}" >> $mesh_script_filename
     echo 'SYSTEM_TYPE=mesh' >> $mesh_script_filename
     echo 'INSTALLING_ON_BBB=no' >> $mesh_script_filename
-    echo 'USB_DRIVE=/dev/sdb1' >> $mesh_script_filename
+    echo 'USB_DRIVE=/dev/sda1' >> $mesh_script_filename
     echo 'DDNS_PROVIDER=' >> $mesh_script_filename
     echo 'DDNS_USERNAME=' >> $mesh_script_filename
     echo 'DDNS_PASSWORD=' >> $mesh_script_filename