fix: regression for variable def completion #1622 (#1624)

impacts graphiql, codemirror-graphql, monaco-graphql, and the lsp server. non null list types as variables had a parser bugfix, and we overlooked how that impacted code completion for variable definitions

Author: acao

packages/graphql-language-service-interface/src/getAutocompleteSuggestions.ts

@@ -186,7 +186,8 @@ export function getAutocompleteSuggestions(
     (kind === RuleKinds.NAMED_TYPE &&
       state.prevState &&
       (state.prevState.kind === RuleKinds.VARIABLE_DEFINITION ||
-        state.prevState.kind === RuleKinds.LIST_TYPE))
+        state.prevState.kind === RuleKinds.LIST_TYPE ||
+        state.prevState.kind === RuleKinds.NON_NULL_TYPE))
   ) {
     return getSuggestionsForVariableDefinition(token, schema, kind);
   }