IGN:Remove some bugs in SVG files

src/calibre/gui2/images/dialog_information.svg

@@ -2946,13 +2946,6 @@
    id="defs155" />
 		<clipPath
    id="XMLID_216_">
-			<use
-   xlink:href="#XMLID_36_"
-   id="use159"
-   x="0"
-   y="0"
-   width="121"
-   height="120" />
 		</clipPath>
 		<g
    clip-path="url(#XMLID_216_)"

src/calibre/gui2/images/mimetypes/lit.svg

@@ -1345,15 +1345,6 @@
        y1="60.2349"
        x2="78.0723"
        y2="59.9854" />
-    <linearGradient
-       inkscape:collect="always"
-       xlink:href="#XMLID_36_"
-       id="linearGradient34419"
-       gradientUnits="userSpaceOnUse"
-       x1="87.5879"
-       y1="62.2827"
-       x2="87.5879"
-       y2="62.0488" />
     <linearGradient
        inkscape:collect="always"
        xlink:href="#linearGradient5227"

src/calibre/gui2/images/sync.svg

@@ -919,15 +919,6 @@
        y1="230.0503"
        x2="22.5229"
        y2="230.0503" />
-    <linearGradient
-       inkscape:collect="always"
-       xlink:href="#XMLID_36_"
-       id="linearGradient4707"
-       gradientUnits="userSpaceOnUse"
-       x1="61.4678"
-       y1="235.5952"
-       x2="119.1562"
-       y2="235.5952" />
     <linearGradient
        inkscape:collect="always"
        xlink:href="#XMLID_38_"