patch 8.1.1550: when a popup has left padding text may be cut off

Problem:    When a popup has left padding text may be cut off.
Solution:   Add the border and padding when computing the size.
diff --git a/src/version.c b/src/version.c
index 4d49173..96670c6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1550,
+/**/
     1549,
 /**/
     1548,