fix(templates): missing call to RegisterMsgServer (ignite#2636)

Fix ignite#1960

From the cosmos-docs [1], this method `RegisterMsgServer` should be
called inside the module `RegisterServices`. The fact that we manage to
run a chain w/o that call is still a mistery for now.

[1] https://docs.cosmos.network/main/building-modules/messages-and-queries.html#msg-services

Co-authored-by: Lucas Btd <lucas.bertrand.22@gmail.com>

Author: tbruyelle

ignite/templates/module/create/stargate/x/{{moduleName}}/module.go.plush

@@ -140,6 +140,7 @@ func (am AppModule) LegacyQuerierHandler(legacyQuerierCdc *codec.LegacyAmino) sd
 // RegisterServices registers a GRPC query service to respond to the
 // module-specific GRPC queries.
 func (am AppModule) RegisterServices(cfg module.Configurator) {
+    types.RegisterMsgServer(cfg.MsgServer(), keeper.NewMsgServerImpl(am.keeper))
     types.RegisterQueryServer(cfg.QueryServer(), am.keeper)
 }