docs: use white background instead of transparent for db img

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@66067 15284696-431f-4ddb-bdfa-cd5b030d7da7

doc/grass_database.svg

@@ -15,8 +15,8 @@
    id="svg2"
    version="1.1"
    inkscape:version="0.91 r13725"
-   sodipodi:docname="grass_database_s.svg"
-   inkscape:export-filename="grass_database_structure.png"
+   sodipodi:docname="grass_database.svg"
+   inkscape:export-filename="grass_database.png"
    inkscape:export-xdpi="97.797638"
    inkscape:export-ydpi="97.797638">
   <defs
@@ -26,10 +26,10 @@
      pagecolor="#ffffff"
      bordercolor="#666666"
      borderopacity="1.0"
-     inkscape:pageopacity="0.0"
+     inkscape:pageopacity="1"
      inkscape:pageshadow="2"
      inkscape:zoom="0.98994949"
-     inkscape:cx="516.9675"
+     inkscape:cx="159.3735"
      inkscape:cy="218.52638"
      inkscape:document-units="px"
      inkscape:current-layer="layer3"
@@ -282,7 +282,7 @@
            height="110.10663"
            x="445.47726"
            y="739.2149" /></flowRegion><flowPara
-         id="flowPara4196"></flowPara></flowRoot>    <text
+         id="flowPara4196" /></flowRoot>    <text
        xml:space="preserve"
        style="font-style:normal;font-weight:normal;font-size:10px;line-height:125%;font-family:Sans;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:4.43300009;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
        x="616.44299"