tests: no need to explicitly export HOME in test files

the test runner ensures that HOME is set to a temp dir

tests/test-convert-baz

@@ -2,10 +2,6 b''
 
 "$TESTDIR/hghave" baz || exit 80
 
-mkdir do_not_use_HOME_baz
-cd do_not_use_HOME_baz
-HOME=`pwd`; export HOME
-cd ..
 baz my-id "mercurial <[e-mail]>"
 
 echo "[extensions]" >> $HGRCPATH

tests/test-convert-darcs.t

@@ -4,7 +4,6 b''
   $ echo "convert=" >> $HGRCPATH
   $ echo 'graphlog =' >> $HGRCPATH
   $ DARCS_EMAIL='[e-mail]'; export DARCS_EMAIL
-  $ HOME=`pwd`/do_not_use_HOME_darcs; export HOME
 
 skip if we can't import elementtree
 

tests/test-convert-mtn.t

@@ -8,7 +8,6 b' on Windows. Having a variable here ease '
   $ echo "[extensions]" >> $HGRCPATH
   $ echo "convert=" >> $HGRCPATH
   $ echo 'graphlog =' >> $HGRCPATH
-  $ HOME=`pwd`/do_not_use_HOME_mtn; export HOME
 
 Windows version of monotone home
 

tests/test-convert-tla.t

@@ -1,9 +1,5 b''
 
   $ "$TESTDIR/hghave" tla || exit 80
-  $ mkdir do_not_use_HOME_tla
-  $ cd do_not_use_HOME_tla
-  $ HOME=`pwd`; export HOME
-  $ cd ..
   $ tla my-id "mercurial <[e-mail]>"
   $ echo "[extensions]" >> $HGRCPATH
   $ echo "convert=" >> $HGRCPATH