Input fields are always editable...

if the document isn't read-only. So backspace should always work in
input fields.

Regression from 961315f0.

Change-Id: I06648ab075b198ee7914e7ae60bef87e7ff94f0a
Reviewed-on: https://gerrit.libreoffice.org/10833Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sw/source/uibase/docvw/edtwin.cxx

@@ -1892,8 +1892,7 @@ KEYINPUT_CHECKTABLE_INSDEL:
                 break;
                 case KEY_BACKSPACE:
                 case KEY_BACKSPACE | KEY_SHIFT:
-                    if ( !rSh.HasReadonlySel()
-                         && !rSh.CrsrInsideInputFld() )
+                    if ( !rSh.HasReadonlySel() )
                     {
                         bool bDone = false;
                         // try to add comment for code snip: