multi: rename nolint:lll to nolint:ll

Find and replace all nolint instances refering to the `lll` linter and
replace with `ll` which is the name of our custom version of the `lll`
linter which can be used to ignore log lines during linting.

The next commit will do the configuration of the custom linter and
disable the default one.

lncfg/protocol_legacy_on.go

@@ -7,7 +7,7 @@ package lncfg
 // are mostly used for integration tests as most modern nodes should always run
 // with them on by default.
 //
-//nolint:lll
+//nolint:ll
 type LegacyProtocol struct {
 	// LegacyOnionFormat if set to true, then we won't signal
 	// TLVOnionPayloadOptional. As a result, nodes that include us in the