patch 8.1.0092: prompt buffer test fails

Problem:    Prompt buffer test fails.
Solution:   Set 'nomodified' before closing the window. (Ozaki Kiichi,
            closes #3051
diff --git a/src/version.c b/src/version.c
index 3fcdb73..80a3c2c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    92,
+/**/
     91,
 /**/
     90,