CLEANUP: contrib/prometheus-exporter: align for with srv status case

the for loop was wrongly indented following our recent rework

Signed-off-by: William Dauchy <wdauchy@gmail.com>
diff --git a/contrib/prometheus-exporter/service-prometheus.c b/contrib/prometheus-exporter/service-prometheus.c
index 403f5a6..1b08fcf 100644
--- a/contrib/prometheus-exporter/service-prometheus.c
+++ b/contrib/prometheus-exporter/service-prometheus.c
@@ -861,7 +861,7 @@
 				switch (appctx->st2) {
 					case ST_F_STATUS:
 						state = promex_srv_status(sv);
-					for (; appctx->ctx.stats.st_code < PROMEX_SRV_STATE_COUNT; appctx->ctx.stats.st_code++) {
+						for (; appctx->ctx.stats.st_code < PROMEX_SRV_STATE_COUNT; appctx->ctx.stats.st_code++) {
 							val = mkf_u32(FO_STATUS, state == appctx->ctx.stats.st_code);
 							labels[2].name = ist("state");
 							labels[2].value = promex_srv_st[appctx->ctx.stats.st_code];