Fix parsing of sourcing with quotes

when argumentNode.text == 'source "./issue206.sh"',
argumentNode.namedChildren contains an element that is string_content
with text=='"./issue206.sh"'

Author: Blake Easley

server/src/util/sourcing.ts

@@ -109,13 +109,15 @@ function getSourcedPathInfoFromNode({
       }
 
       if (argumentNode.type === 'string' || argumentNode.type === 'raw_string') {
-        if (argumentNode.namedChildren.length === 0) {
+        const children = argumentNode.namedChildren
+        if (
+          children.length === 0 ||
+          (children.length === 1 && children[0].type === 'string_content')
+        )
           return {
             sourcedPath: argumentNode.text.slice(1, -1),
           }
-        }
       }
-
       // TODO: we could try to parse any ShellCheck "source "directive
       // # shellcheck source=src/examples/config.sh
       return {