patch 8.2.3887: E1135 is used for two different errors

Problem:    E1135 is used for two different errors.
Solution:   Renumber one error.
diff --git a/src/errors.h b/src/errors.h
index 8d8a2ca..e5b8cd2 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -603,10 +603,8 @@
 EXTERN char e_using_string_as_bool_str[]
 	INIT(= N_("E1135: Using a String as a Bool: \"%s\""));
 #endif
-EXTERN char e_cmd_mapping_must_end_with_cr[]
-	INIT(=N_("E1135: <Cmd> mapping must end with <CR>"));
 EXTERN char e_cmd_mapping_must_end_with_cr_before_second_cmd[]
-	INIT(=N_("E1136: <Cmd> mapping must end with <CR> before second <Cmd>"));
+	INIT(= N_("E1136: <Cmd> mapping must end with <CR> before second <Cmd>"));
 EXTERN char e_cmd_maping_must_not_include_str_key[]
 	INIT(= N_("E1137: <Cmd> mapping must not include %s key"));
 EXTERN char e_using_bool_as_number[]
@@ -852,3 +850,5 @@
 	INIT(= N_("E1253: String expected for argument %d"));
 EXTERN char e_cannot_use_script_variable_in_for_loop[]
 	INIT(= N_("E1254: Cannot use script variable in for loop"));
+EXTERN char e_cmd_mapping_must_end_with_cr[]
+	INIT(= N_("E1255: <Cmd> mapping must end with <CR>"));