crecord: avoid duplicating lines when reverting noeol->eol change

When reversing a patch that looks like this while using crecord:

```
@@ -301,4 +302,4 @@ zza
 zzb
 zzc
 zzd
-zze
\ No newline at end of file
+zze
```

we would previously reverse the `-zze` line to be an add, encounter the "no
newline" line and stop inspecting lines. This caused us to duplicate the line,
producing `zzezze` (still without a newline).

`break` is the correct action if we know there will be no lines afterwards, as
would be the case in an eol -> noeol transition. It is incorrect if there are
lines afterward, such as if both sides are missing the newline or if only the
lhs is missing the newline.

Differential Revision: https://phab.mercurial-scm.org/D12441

mercurial/crecord.py

@@ -505,7 +505,7 b' class uihunk(patchnode):'
             text = line.linetext
             if line.linetext == diffhelper.MISSING_NEWLINE_MARKER:
                 noeol = True
-                break
+                continue
             if line.applied:
                 if text.startswith(b'+'):
                     dels.append(text[1:])

tests/test-revert-interactive-curses.t

@@ -68,6 +68,5 b' When a selected line is reverted to have'
   $ do_revert
   reverting a
   $ cat a
-  0 (wdir known-bad-output !)
   0 (no-eol)