[orca] Remove old column-header presentation suppression for Thunderbird

[Joanmarie Diggs <joanied src gnome org>]

commit a3881c6cfbdc3efa1927a12b0ef23733d8973861
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Fri Feb 10 05:42:28 2017 -0500

    Remove old column-header presentation suppression for Thunderbird
    
    We were suppressing it due to chattiness when we had to put together
    the full row from its cells. Accessible rows are now exposed to us
    and we present those instead of the cells. Problem solved. And it
    seems like this suppression interferes with presentation of valid
    headers we wish to present.

 src/orca/scripts/apps/Thunderbird/Makefile.am      |    1 -
 .../scripts/apps/Thunderbird/speech_generator.py   |   48 --------------------
 2 files changed, 0 insertions(+), 49 deletions(-)
---
diff --git a/src/orca/scripts/apps/Thunderbird/Makefile.am b/src/orca/scripts/apps/Thunderbird/Makefile.am
index 059501c..9db875e 100644
--- a/src/orca/scripts/apps/Thunderbird/Makefile.am
+++ b/src/orca/scripts/apps/Thunderbird/Makefile.am
@@ -1,7 +1,6 @@
 orca_python_PYTHON = \
        __init__.py \
        script.py \
-       speech_generator.py \
        spellcheck.py
 
 orca_pythondir=$(pkgpythondir)/scripts/apps/Thunderbird