patch 8.1.0803: session file has problem with single quote in file name

Problem:    Session file has problem with single quote in file name. (Jon
            Crowe)
Solution:   Use a double quoted string.  Add a test.
diff --git a/src/version.c b/src/version.c
index 5b404ed..dcbf1c2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -792,6 +792,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    803,
+/**/
     802,
 /**/
     801,