fix double precision problem

lib/misc.vala

@@ -55,7 +55,8 @@ namespace LibSernatur {
 			 * @return Returns a string of the percentage
 			 */
 			public static string format_double (double value) {
-				return (value * 100).to_string () + "%";
+				// Remove the double precision by converting to float
+				return ((float) (value * (double) 100)).to_string () + "%";
 			}
 		}