test-dispatch.t: remove incorrect "cd $dir"

A line that should have been removed in 50fbe9063ff2.

tests/test-dispatch.t

@@ -1,58 +1,57 b''
 test command parsing and dispatch
 
   $ hg init a
   $ cd a
 
 Redundant options used to crash (issue436):
   $ hg -v log -v
   $ hg -v log -v x
 
   $ echo a > a
   $ hg ci -Ama
   adding a
 
 Missing arg:
 
   $ hg cat
   hg cat: invalid arguments
   hg cat [OPTION]... FILE...
   
   output the current or given revision of files
   
   options:
   
    -o --output FORMAT       print output to file with formatted name
    -r --rev REV             print the given revision
       --decode              apply any matching decode filter
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
   
   [+] marked option can be specified multiple times
   
   use "hg help cat" to show the full help text
   [255]
 
 [defaults]
 
   $ hg cat a
   a
   $ cat >> $HGRCPATH <<EOF
   > [defaults]
   > cat = -r null
   > EOF
   $ hg cat a
   a: no such file in rev 000000000000
   [1]
 
   $ cd "$TESTTMP"
 
 #if no-outer-repo
 
 No repo:
 
-  $ cd $dir
   $ hg cat
   abort: no repository found in '$TESTTMP' (.hg not found)!
   [255]
 
 #endif