patch 8.2.1903: buffer test fails with normal features

Problem:    Buffer test fails with normal features.
Solution:   Use 'numberwidth' instead of 'conceallevel' in the test.

src/testdir/test_buffer.vim

@@ -364,11 +364,11 @@ endfunc
 
 func Test_badd_options()
   new SomeNewBuffer
-  setlocal cole=3
+  setlocal numberwidth=3
   wincmd p
   badd SomeNewBuffer
   new SomeNewBuffer
-  call assert_equal(3, &cole)
+  call assert_equal(3, &numberwidth)
   close
   close
   bwipe! SomeNewBuffer

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1903,
 /**/
     1902,
 /**/