t9164: Add missing quotes in test

This fixes `ambiguous redirect' error given by bash.

[ew: fix misspelled test name,
     also eliminate space after ">>" to conform to guidelines]

Signed-off-by: Eric Wong <normalperson@yhbt.net>

t/t9164-git-svn-dcommit-concurrent.sh

@@ -62,8 +62,8 @@ EOF1
 	if [ "$hook_type" = "pre-commit" ]; then
 		echo "echo 'commit disallowed' >&2; exit 1" >>"$hook"
 	else
-		echo "PATH=\"$PATH\"; export PATH" >> $hook
-		echo "svnconf=\"$svnconf\"" >> $hook
+		echo "PATH=\"$PATH\"; export PATH" >>"$hook"
+		echo "svnconf=\"$svnconf\"" >>"$hook"
 		cat >>"$hook" <<- 'EOF2'
 			cd work-auto-commits.svn
 			svn up --config-dir "$svnconf"