Fix parser translator tokens for %x(#{})

It falsely considered it to be a single backtick command

Author: Earlopain

lib/prism/translation/parser/lexer.rb

@@ -483,7 +483,8 @@ def to_a
                 type = :tIDENTIFIER
               end
             when :tXSTRING_BEG
-              if (next_token = lexed[index][0]) && next_token.type != :STRING_CONTENT && next_token.type != :STRING_END
+              if (next_token = lexed[index][0]) && !%i[STRING_CONTENT STRING_END EMBEXPR_BEGIN].include?(next_token.type)
+                # self.`()
                 type = :tBACK_REF2
               end
               quote_stack.push(value)

test/prism/ruby/parser_test.rb

@@ -98,7 +98,6 @@ class ParserTest < TestCase
       "heredocs_with_ignored_newlines.txt",
       "methods.txt",
       "strings.txt",
-      "seattlerb/backticks_interpolation_line.txt",
       "seattlerb/bug169.txt",
       "seattlerb/case_in.txt",
       "seattlerb/difficult4__leading_dots2.txt",