patch 8.0.0877: using CTRL-\ CTRL-N in terminal is inconsistent

Problem:    Using CTRL-\ CTRL-N in terminal is inconsistent.
Solution:   Stay in Normal mode.
diff --git a/src/proto/terminal.pro b/src/proto/terminal.pro
index fbd17ed..8d02968 100644
--- a/src/proto/terminal.pro
+++ b/src/proto/terminal.pro
@@ -3,10 +3,10 @@
 void free_terminal(buf_T *buf);
 void write_to_term(buf_T *buffer, char_u *msg, channel_T *channel);
 int term_job_running(term_T *term);
-int term_in_terminal_mode(void);
-void term_leave_terminal_mode(void);
+int term_in_normal_mode(void);
+void term_enter_job_mode(void);
 int send_keys_to_term(term_T *term, int c, int typed);
-int term_use_loop(int once);
+int term_use_loop(void);
 int terminal_loop(void);
 void term_job_ended(job_T *job);
 void term_channel_closed(channel_T *ch);