m/node/core/localstorage: fix EFI directory name

The EFI directory is called EFI, not ESP. The ESPEFIDirectory is not
used anywhere, so this typo did not have any effect.

Change-Id: I38cd44ee06cb5f210acbd4a608e499b0372c2633
Reviewed-on: https://review.monogon.dev/c/monogon/+/3476
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/metropolis/node/core/localstorage/storage_esp.go b/metropolis/node/core/localstorage/storage_esp.go
index 6404725..b449734 100644
--- a/metropolis/node/core/localstorage/storage_esp.go
+++ b/metropolis/node/core/localstorage/storage_esp.go
@@ -37,7 +37,7 @@
 type ESPDirectory struct {
 	declarative.Directory
 	Metropolis ESPMetropolisDirectory `dir:"metropolis"`
-	EFI        ESPEFIDirectory        `dir:"ESP"`
+	EFI        ESPEFIDirectory        `dir:"EFI"`
 }
 
 type ESPEFIDirectory struct {