Fix: local keyword outside function in --local-only block

flag_key was declared with 'local' at script top level, which is only
valid inside bash functions. This left flag_key empty, writing '=true'
(malformed) to setup.db instead of 'HOST1_LOCAL_DONE=true'.
Changed to a plain variable assignment.

Partnership/partnership_manager.sh

@@ -1465,7 +1465,7 @@ if (vv_write_conf_raw('master.conf', \$master)) {
         # Write HOST1_LOCAL_DONE flag to setup.db
         local_state_file="/boot/config/varaverk_setup.db"
         if [[ "$DRY_RUN" == false ]]; then
-            local flag_key="${MY_ID}_LOCAL_DONE"
+            flag_key="${MY_ID}_LOCAL_DONE"
             if grep -q "^${flag_key}=" "$local_state_file" 2>/dev/null; then
                 sed -i "s|^${flag_key}=.*|${flag_key}=true|" "$local_state_file"
             else