test/: Run calcurse in read-only mode

We don't change any configuration nor do we modify items here, so we can
safely invoke calcurse in read-only mode. Fixes a couple of permission
errors seen with `make distcheck`.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

test/range-003.sh

@@ -6,9 +6,9 @@ if [ ! -x "$(command -v faketime)" ]; then
 fi
 
 if [ "$1" = 'actual' ]; then
-  faketime '2000-01-01 00:00:00' "$CALCURSE" -D "$DATA_DIR"/ -r400
+  faketime '2000-01-01 00:00:00' "$CALCURSE" --read-only -D "$DATA_DIR"/ -r400
 elif [ "$1" = 'expected' ]; then
-  "$CALCURSE" -D "$DATA_DIR"/ -s01/01/2000 -r400
+  "$CALCURSE" --read-only -D "$DATA_DIR"/ -s01/01/2000 -r400
 else
   ./run-test "$0"
 fi