patch 8.2.1526: line in testdir Makefile got commented out

Problem:    Line in testdir Makefile got commented out. (Christian Brabandt)
Solution:   Revert.
diff --git a/src/version.c b/src/version.c
index 71851c8..514cc68 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1526,
+/**/
     1525,
 /**/
     1524,