use height instead of max-height to control img size on parent div

this change happens on both image-size-control and figure-img-size

layouts/shortcodes/figure-img-size.html

@@ -3,7 +3,7 @@
 <figure class="center align-center">
   <div class="image-size-control" style="
 {{- with $width }}max-width: {{ . }};{{ end -}}
-{{- with $height }}max-height: {{ . }};{{ end -}}
+{{- with $height }}height: {{ . }};{{ end -}}
 ">
     {{ .Page.RenderString .Inner }}
   </div>

layouts/shortcodes/image-size-control.html

@@ -1,6 +1,6 @@
 <div class="image-size-control" style="
 {{- with (.Get "width") }}max-width: {{ . }};{{ end -}}
-{{- with (.Get "height") }}max-height: {{ . }};{{ end -}}
+{{- with (.Get "height") }}height: {{ . }};{{ end -}}
 ">
   {{ .Page.RenderString .Inner }}
 </div>