fix line break in interval input

templates/lib/interval.html

@@ -1,5 +1,6 @@
 {% macro interval_input(obj, attrname, scales) -%}
 
+<span style='display:inline-block'>
     <input type=number name={{attrname}}_significand
     value={{obj[attrname + '_significand']}}
     min=0 step=1>
@@ -10,6 +11,7 @@ min=0 step=1>
         >{{scale[0]}}</option>
     {% endfor -%}
     </select>
+</span>
 
 
 {%- endmacro %}