scripts: Remove deprecated iconUrl from NuGet package

The logo.svg link is dead anyway.

scripts/nuget/pugixml.nuspec

@@ -9,7 +9,6 @@
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
     <license type="expression">MIT</license>
     <projectUrl>https://pugixml.org/</projectUrl>
-    <iconUrl>https://github.com/zeux/pugixml/logo.svg</iconUrl>
     <description>pugixml is a C++ XML processing library, which consists of a DOM-like interface with rich traversal/modification capabilities, an extremely fast XML parser which constructs the DOM tree from an XML file/buffer, and an XPath 1.0 implementation for complex data-driven tree queries. Full Unicode support is also available, with Unicode interface variants and conversions between different Unicode encodings (which happen automatically during parsing/saving).
 pugixml is used by a lot of projects, both open-source and proprietary, for performance and easy-to-use interface.
 This package contains builds for VS2013, VS2015, VS2017 and VS2019, for both statically linked and DLL CRT; you can switch the CRT linkage in Project -> Properties -> Referenced Packages -> pugixml.</description>