patch 8.1.2375: no suffucient testing for registers

Problem:    No suffucient testing for registers.
Solution:   Add more test cases. (Yegappan Lakshmanan, closes #5296)
            Fix that "p" on last virtual column of tab inserts spaces.
diff --git a/src/version.c b/src/version.c
index 5b4b898..a2e1ddb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2375,
+/**/
     2374,
 /**/
     2373,