fix(stats): drop redundant null-coalesce on a guaranteed array key

The report array shape always carries unmappedPriceIds, so the ?? [] was dead
and tripped larastan's nullCoalesce.offset. No behaviour change.

app/Console/Commands/SendPriceExperimentFunnelReportCommand.php

@@ -128,7 +128,7 @@ class SendPriceExperimentFunnelReportCommand extends Command
             $lines[] = '⚠ REVENUE UNAVAILABLE — Stripe prices could not be loaded; MRR/CM are blank this run.';
         }
 
-        if (($report['unmappedPriceIds'] ?? []) !== []) {
+        if ($report['unmappedPriceIds'] !== []) {
             $lines[] = '';
             $lines[] = '⚠ UNMAPPED PRICES — net-active subs on price ids absent from the revenue map '
                 .'(MRR undercounted as 0): '.implode(', ', $report['unmappedPriceIds'])