add cross to background of xray error image

prevents that small error regions are totally covered by the background and therefore invisible

resources/images/xray_error.svg

@@ -1,17 +1,52 @@
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+
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    xmlns:cc="http://creativecommons.org/ns#"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:svg="http://www.w3.org/2000/svg"
    xmlns="http://www.w3.org/2000/svg"
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-   version="1.1"
-   viewBox="0 0 8.4666665 8.4666665"
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    height="31.999998"
-   width="31.999998">
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      id="defs2" />
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@@ -25,34 +60,65 @@
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