Remove variables and leftovers of pregenerated ACL content

Prior to the code reorg, we would generate rules from the Policy and
store it on the global object. Now we generate it on the fly for each node
and this commit cleans up the old variables to make sure we have no
unexpected side effects.

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

hscontrol/db/db.go

@@ -36,9 +36,8 @@ type KV struct {
 }
 
 type HSDatabase struct {
-	db               *gorm.DB
-	notifyStateChan  chan<- struct{}
-	notifyPolicyChan chan<- struct{}
+	db              *gorm.DB
+	notifyStateChan chan<- struct{}
 
 	ipAllocationMutex sync.Mutex
 
@@ -53,7 +52,6 @@ func NewHeadscaleDatabase(
 	dbType, connectionAddr string,
 	stripEmailDomain, debug bool,
 	notifyStateChan chan<- struct{},
-	notifyPolicyChan chan<- struct{},
 	ipPrefixes []netip.Prefix,
 	baseDomain string,
 ) (*HSDatabase, error) {
@@ -63,9 +61,8 @@ func NewHeadscaleDatabase(
 	}
 
 	db := HSDatabase{
-		db:               dbConn,
-		notifyStateChan:  notifyStateChan,
-		notifyPolicyChan: notifyPolicyChan,
+		db:              dbConn,
+		notifyStateChan: notifyStateChan,
 
 		ipPrefixes:       ipPrefixes,
 		baseDomain:       baseDomain,