Icons: delete unused sources

bitmaps_png/sources/erc_error_ver2.svg

@@ -1,36 +0,0 @@
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-            <dc:format>image/svg+xml</dc:format>
-            <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
-            <dc:title>add_arc</dc:title>
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-            <cc:requires rdf:resource="http://creativecommons.org/ns#Attribution" />
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-   <title id="title116907">erc_error_ver2</title>
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