patch 9.0.0746: breakindent test cases are commented out

Problem:    Breakindent test cases are commented out.
Solution:   Adjust expected result to slightly different behavior.  Correct
            computations for cursor position.
diff --git a/src/testdir/test_breakindent.vim b/src/testdir/test_breakindent.vim
index 8255b85..9719c3d 100644
--- a/src/testdir/test_breakindent.vim
+++ b/src/testdir/test_breakindent.vim
@@ -683,7 +683,7 @@
   call s:compare_lines(expect, lines)
   " Scroll down one screen line
   setl scrolloff=5
-  norm! 5gj
+  norm! 6gj
   redraw!
   let lines = s:screen_lines(1, 20)
   let expect = [
@@ -691,8 +691,7 @@
 	\ "    mnopqrstabcdefgh",
 	\ "    ijklmnopqrstabcd",
 	\ ]
-  " FIXME: this currently fails
-  " call s:compare_lines(expect, lines)
+  call s:compare_lines(expect, lines)
 
   setl briopt+=shift:2
   norm! 1gg
@@ -704,15 +703,14 @@
 	\ ]
   call s:compare_lines(expect, lines)
   " Scroll down one screen line
-  norm! 5gj
+  norm! 6gj
   let lines = s:screen_lines(1, 20)
   let expect = [
 	\ "<<<   qrstabcdefghij",
 	\ "      klmnopqrstabcd",
 	\ "      efghijklmnopqr",
 	\ ]
-  " FIXME: this currently fails
-  " call s:compare_lines(expect, lines)
+  call s:compare_lines(expect, lines)
 
   call s:close_windows('set breakindent& briopt& cpo& number&')
 endfunc