Remove invalid byte sequence input from rendering test

yamatanooroti handles invalid byte sequence input "\M-[char]" and converts it to "\e[char]"
We don't need to use these invalid byte sequence and rely on the hack implemented in yamatanooroti

test/reline/yamatanooroti/test_rendering.rb

@@ -571,7 +571,7 @@ def test_bracketed_paste_with_undo_redo
         Multiline REPL.
         prompt> abc
       EOC
-      write("\M-\C-_")
+      write("\e\C-_")
       assert_screen(<<~EOC)
         Multiline REPL.
         prompt> abcdef hoge
@@ -853,7 +853,7 @@ def test_reset_rest_height_when_clear_screen
 
     def test_meta_key
       start_terminal(30, 20, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl}, startup_message: 'Multiline REPL.')
-      write("def ge\M-bho")
+      write("def ge\ebho")
       assert_screen(<<~EOC)
         Multiline REPL.
         prompt> def hoge
@@ -874,7 +874,7 @@ def test_not_meta_key
     def test_force_enter
       start_terminal(30, 120, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl}, startup_message: 'Multiline REPL.')
       write("def hoge\nend\C-p\C-e")
-      write("\M-\x0D")
+      write("\e\x0D")
       assert_screen(<<~EOC)
         Multiline REPL.
         prompt> def hoge
@@ -919,7 +919,7 @@ def test_eof_without_newline
 
     def test_em_set_mark_and_em_exchange_mark
       start_terminal(10, 50, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl}, startup_message: 'Multiline REPL.')
-      write("aaa bbb ccc ddd\M-b\M-b\M-\x20\M-b\C-x\C-xX\C-x\C-xY")
+      write("aaa bbb ccc ddd\eb\eb\e\x20\eb\C-x\C-xX\C-x\C-xY")
       assert_screen(<<~'EOC')
         Multiline REPL.
         prompt> aaa Ybbb Xccc ddd
@@ -1519,7 +1519,7 @@ def test_dialog_with_fullwidth_scrollbar
     def test_rerender_argument_prompt_after_pasting
       start_terminal(20, 30, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl}, startup_message: 'Multiline REPL.')
       write('abcdef')
-      write("\M-3\C-h")
+      write("\e3\C-h")
       assert_screen(<<~'EOC')
         Multiline REPL.
         prompt> abc
@@ -1655,7 +1655,7 @@ def test_insert_newline_in_the_middle_of_buffer_just_after_dialog
       write("class A\n  def a\n    3\n  end\nend")
       write("\n")
       write("\C-p\C-p\C-p\C-p\C-p\C-e\C-hS")
-      write("\M-\x0D")
+      write("\e\x0D")
       write("  3")
       assert_screen(<<~'EOC')
         prompt>     3