[wiki] fix bug with disk size in TB

Bug was for yeti NVMe: 1.0TB reported instead of 1.6TB.
Must force float type for division.

lib/refrepo/gen/wiki/generators/hardware.rb

@@ -262,7 +262,7 @@ class G5KHardwareGenerator < WikiGenerator
 
   def storage_size_to_text(s)
     if s > 1000*1000*1000*1000 # 1 TB
-      return sprintf("%.1f", s/(1000*1000*1000*1000)) + ' TB'
+      return sprintf("%.1f", s.to_f/(1000*1000*1000*1000)) + ' TB'
     else
       return sprintf("%d", s/(1000*1000*1000)) + ' GB'
     end