patch 9.0.1756: failing cursorline sign test

Problem:  failing cursorline sign test
Solution: only reset char attr, if cursorline
          option is not set

Unfortunately, commit dbeadf05b6a152e7d9c5cc23d9202057f8e99884 causes a
failure with the sign test Test_sign_cursor_position()

The root cause is, that resetting the character attribute will also
reset the existing cursor line highlighting and this breaks the test,
that expects the cursor line highlighting to overrule the sign line
highlighting.

So change the condition to reset the character attribute by making sure
that this only happens, if the 'cursorline' option is not active and the
cursor is not at the same line as the line to be drawn

closes: #12854
closes: #12859

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index b5dae7f..bc3ddc1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1756,
+/**/
     1755,
 /**/
     1754,