tests: cleanup of tests that ended up outside $TESTTMP

No harm done, but it might confuse later on.

tests/test-hgrc.t

@@ -117,7 +117,6 b' showconfig with multiple arguments'
 
 HGPLAIN
 
-  $ cd ..
   $ p=`pwd`
   $ echo "[ui]" > $HGRC
   $ echo "debug=true" >> $HGRC

tests/test-update-renames.t

@@ -25,6 +25,3 b' Update with local changes across a file '
   0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges
   [1]
-
-  $ cd ..
-