patch 8.0.1824: Coverity warns for variable that may be uninitialized

Problem:    Coverity warns for variable that may be uninitialized.
Solution:   Initialize the variable.
diff --git a/src/terminal.c b/src/terminal.c
index 48bacd9..21ef870 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -2088,7 +2088,7 @@
     int		tty_fd = curbuf->b_term->tl_job->jv_channel
 				 ->ch_part[get_tty_part(curbuf->b_term)].ch_fd;
 #endif
-    int		restore_cursor;
+    int		restore_cursor = FALSE;
 
     /* Remember the terminal we are sending keys to.  However, the terminal
      * might be closed while waiting for a character, e.g. typing "exit" in a