Revert "bumps network and database versions (#610)"

This reverts commit 3e626eac.

plugins/autopeering/autopeering.go

@@ -25,7 +25,7 @@ import (
 // autopeering constants
 const (
 	ProtocolVersion = 0 // update on protocol changes
-	NetworkVersion  = 3 // update on network changes
+	NetworkVersion  = 2 // update on network changes
 )
 
 var (

plugins/database/versioning.go

@@ -10,7 +10,7 @@ import (
 const (
 	// DBVersion defines the version of the database schema this version of GoShimmer supports.
 	// Every time there's a breaking change regarding the stored data, this version flag should be adjusted.
-	DBVersion = 4
+	DBVersion = 3
 )
 
 var (