tests/test-hgweb-diffs

patch: turned strings with backslashes into raw strings

In Python, the backslash in an unrecognized escape sequence is left
behind, which makes '\.' the same as r'\.'. Relying on this feature is
quite brittle, IMHO.

Removed unnecessary string concatenation as well.

echo % setting up repo
hg init test
cd test
echo a > a
echo b > b
hg ci -Ama

echo % change permissions for git diffs
chmod 755 a
hg ci -Amb

echo % set up hgweb
hg serve -n test -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log
cat hg.pid >> $DAEMON_PIDS

echo % revision
"$TESTDIR/get-with-headers.py" localhost:$HGPORT '/rev/0'

echo % diff removed file
"$TESTDIR/get-with-headers.py" localhost:$HGPORT '/diff/tip/a'

echo % set up hgweb with git diffs
"$TESTDIR/killdaemons.py"
hg serve --config 'diff.git=1' -n test -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log
cat hg.pid >> $DAEMON_PIDS

echo % revision
"$TESTDIR/get-with-headers.py" localhost:$HGPORT '/rev/0'

echo % diff removed file
"$TESTDIR/get-with-headers.py" localhost:$HGPORT '/diff/tip/a'

echo % errors
cat errors.log