patch 8.0.0725: a terminal window does not handle keyboard input

Problem:    A terminal window does not handle keyboard input.
Solution:   Add terminal_loop().  ":term bash -i" sort of works now.
diff --git a/src/main.c b/src/main.c
index 6e21f73..268c256 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1354,7 +1354,14 @@
 	    do_exmode(exmode_active == EXMODE_VIM);
 	}
 	else
+	{
+#ifdef FEAT_TERMINAL
+	    if (curbuf->b_term != NULL && oa.op_type == OP_NOP
+							  && oa.regname == NUL)
+		terminal_loop();
+#endif
 	    normal_cmd(&oa, TRUE);
+	}
     }
 }