Remove misplaced space in Directory.Build.targets

Directory.Build.targets

@@ -18,7 +18,7 @@
   <PropertyGroup
     Condition=" ('$(TargetFrameworkIdentifier)' == '.NETCoreApp') Or
                 ('$(TargetFrameworkIdentifier)' == '.NETFramework' And $([MSBuild]::VersionGreaterThanOrEquals($(TargetFrameworkVersion), '4.7'))) Or
-                ('$(TargetFrameworkIdentifier)' == '.NETStandard ' And $([MSBuild]::VersionGreaterThanOrEquals($(TargetFrameworkVersion), '1.6'))) ">
+                ('$(TargetFrameworkIdentifier)' == '.NETStandard'  And $([MSBuild]::VersionGreaterThanOrEquals($(TargetFrameworkVersion), '1.6'))) ">
     <DefineConstants>$(DefineConstants);SUPPORTS_ECDSA</DefineConstants>
   </PropertyGroup>