Bump o.e.ui.themes to 1.3.0

To indicate removal of Classic theme in
#3833

Author: akurtakov

bundles/org.eclipse.ui.themes/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %Plugin.name
 Bundle-SymbolicName: org.eclipse.ui.themes;singleton:=true
-Bundle-Version: 1.2.3000.qualifier
+Bundle-Version: 1.3.0.qualifier
 Bundle-Vendor: %Plugin.providerName
 Bundle-Localization: plugin
 Require-Bundle: org.eclipse.e4.ui.css.swt.theme