patch 8.2.1748: closing split window in other tab may cause a crash

Problem:    Closing split window in other tab may cause a crash.
Solution:   Set tp_curwin properly. (Rob Pilling, closes #7018)
diff --git a/src/version.c b/src/version.c
index 03765bf..c253d09 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1748,
+/**/
     1747,
 /**/
     1746,