Remove unwanted metadata from SVG files. (Closes: #956102)

softwaves-theme/sources/plymouth/password_field.svg

@@ -21,7 +21,6 @@
    id="svg2"
    inkscape:version="0.91 r13725"
    sodipodi:docname="password_field.svg"
-   inkscape:export-filename="/tmp/password_field.png"
    inkscape:export-xdpi="90"
    inkscape:export-ydpi="90"><metadata
      id="metadata20"><rdf:RDF><cc:Work

softwaves-theme/sources/wiki-banner.svg

@@ -20,7 +20,6 @@
    xml:space="preserve"
    id="svg124"
    sodipodi:docname="wiki-banner.svg"
-   inkscape:export-filename="/tmp/softWaves_wiki_banner.png"
    inkscape:export-xdpi="90"
    inkscape:export-ydpi="90"
    inkscape:version="0.92.1 r15371"><metadata
@@ -113,7 +112,6 @@
      id="background"
      clip-path="url(#SVGID_2_)"
      transform="scale(1.9082016,0.95439056)"
-     inkscape:export-filename="/tmp/softWaves_wiki_banner.png"
      inkscape:export-xdpi="90"
      inkscape:export-ydpi="90"><g
        id="background_1_"><linearGradient