NOBUG: Fixed SVG browser compatibility

lib/filestorage/tests/fixtures/testimage_basic.svg

@@ -1,4 +1,4 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" stroke="#000">
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" stroke="#000" preserveAspectRatio="xMinYMid meet">
   <path d="M8,80s-5,8,5,9l78,0s9,0,5-9l-40-71s-4-6-8,0z" stroke-width="2" fill="#fff" fill-rule="evenodd" />
   <path d="M52,10 L10,85 L93,85z" stroke-width="2" stroke-linejoin="round" fill="#fc0" fill-rule="evenodd"/>
   <path d="M52,32l0,26" stroke-width="9" stroke-linecap="round" fill-rule="evenodd"/>

mod/bigbluebuttonbn/fonts/bigbluebutton-font.svg

@@ -1,6 +1,6 @@
 <?xml version="1.0" standalone="no"?>
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<svg xmlns="http://www.w3.org/2000/svg">
+<svg xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMinYMid meet">
 <metadata>Generated by Fontastic.me</metadata>
 <defs>
 <font id="bigbluebutton-font" horiz-adv-x="512">

mod/bigbluebuttonbn/pix/i/bigbluebutton.svg

@@ -1,6 +1,6 @@
 <?xml version="1.0" standalone="no"?>
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" >
-<svg xmlns="http://www.w3.org/2000/svg">
+<svg xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMinYMid meet">
 <metadata>
 <json>
 <![CDATA[