Remove version suffix from Directory.Build.props

Removed the version suffix from the project properties.

Author: KenticoPavelV

Directory.Build.props

@@ -6,7 +6,7 @@
     <Copyright>Copyright © $(Company) $([System.DateTime]::Now.Year)</Copyright>
     <Trademark>$(Company)™</Trademark>
     <VersionPrefix>6.0.0</VersionPrefix>
-    <VersionSuffix>prerelease-1</VersionSuffix>
+    <VersionSuffix></VersionSuffix>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
 
     <PackageProjectUrl>https://github.com/Kentico/xperience-by-kentico-tag-manager</PackageProjectUrl>