minor fix

Removed the stray "+" introduced when correcting a commit dropped by merge
https://github.com/emonhub/emonhub/commit/f72b5727dc5a7f22daa0c3172a772dd203787c45
https://github.com/emonhub/emonhub/commit/d3da8427917c66c1cf3301181412a63fdd00e5bd
https://github.com/emonhub/emonhub/commit/b42dccfef670c094df59464953c5cce7edf5724f