Properly emit c-escaped string tokens

FIX: Fix a bug that broke tokenizing of `e'\n'`-style strings.

See https://discuss.codemirror.net/t/postgresql-c-style-escape-using-e/8346

Author: marijnh

src/tokens.ts

@@ -243,6 +243,7 @@ export function tokensFor(d: Dialect) {
     } else if ((next == Ch.e || next == Ch.E) && input.next == Ch.SingleQuote) {
       input.advance()
       readLiteral(input, Ch.SingleQuote, true)
+      input.acceptToken(StringToken)
     } else if ((next == Ch.n || next == Ch.N) && input.next == Ch.SingleQuote &&
                d.charSetCasts) {
       input.advance()