Fix hundredths convertion DD2DMS

[pjao]

Possible fix of https://github.com/BrandMeister/bm-rpt2aprs/issues/3#issuecomment-329760921

[nonoo]

Please do the following:

• Keep the code style of the original file
• Don't calculate round(($degrees['seconds']/60)*100) twice
• Use $degrees['minutes']++ instead of $degrees['minutes']=$degrees['minutes']+1;

[nonoo]

What happened? The patch does not solve the issue?

[pjao]

Make another PR #5