Remove 'Packaging' flag from QtWebKit MSVC2017/x86

Qt doesn't provide binaries for this platform.

Change-Id: Iab30435bb480ee898c2409f87facabb26fce9421
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@qt.io>

coin/platform_configs/qtwebkit.txt

 Template                    Target OS           Target arch Compiler    Features
 --------------------------- ------------------- ----------- ----------- -------------------------------------------------------------------------------------
-qtci-windows-10-x86_64-10                       x86         MSVC2017    Packaging DebugAndRelease Release ForceDebugInfo OpenGLDynamic DisableTests
+qtci-windows-10-x86_64-10                       x86         MSVC2017    DebugAndRelease Release ForceDebugInfo OpenGLDynamic DisableTests
 qtci-windows-10-x86_64-10                                   MSVC2017    Packaging DebugAndRelease Release ForceDebugInfo OpenGLDynamic DisableTests
 qtci-windows-7-x86-3                                        Mingw53     Packaging DebugAndRelease Release OpenGLDynamic DisableTests