sharness: do not use spaces in trash directory

With a recent curl update, it now rejects URLs with spaces in it.
We should probably fix this so that we can sanitize urls with spaces
to be used properly, but for now, just remove spaces in the directory.
Signed-off-by: Kevin Morris <kevr@0cost.org>

test/sharness.sh

@@ -895,7 +895,7 @@ SHARNESS_TEST_FILE="$0"
 export SHARNESS_TEST_FILE
 
 # Prepare test area.
-SHARNESS_TRASH_DIRECTORY="trash directory.$(basename "$SHARNESS_TEST_FILE" ".$SHARNESS_TEST_EXTENSION")"
+SHARNESS_TRASH_DIRECTORY="trash_directory.$(basename "$SHARNESS_TEST_FILE" ".$SHARNESS_TEST_EXTENSION")"
 test -n "$root" && SHARNESS_TRASH_DIRECTORY="$root/$SHARNESS_TRASH_DIRECTORY"
 case "$SHARNESS_TRASH_DIRECTORY" in
 /*) ;; # absolute path is good