Fix number of decimal in float

[Brtle]

This line split a float with the . character. However, some float doesn't have a .. For instance, 1e-7 will crash.

This PR try to fix this little issue.

[YehonatanVonage]

Hi @Brtle,
Thank you for the contribution to the "Grafana Status Panel".

TL;DR
I reject your pull request, and changing the master to fix the issue you encountered.

Description:
In javascript, decimal numbers are not represented accurate has you expect.

Try the next code:
let num = 5.56789;
let n = num.toFixed(20).replace(/^-?\d*.?|0+$/g, '')
alert(n)

Your logic fails here. Check also:
http://www.saintsatplay.com/blog/2014/08/handling-floating-point-numbers-in-javascript#.WiUlWLSZ1E4

I pushed another fix to handle your scenario in the master branch, and it will be available in the next release.