Escape strings in RemoveClause

Currently in RemoveClause only symbols are escaped with backticks,
meaning that using `.remove` will fail on labels with special
characters. This can be encountered with a namespaced label name, such
as MyModule::MyThing.

lib/neo4j/core/query_clauses.rb

@@ -643,9 +643,7 @@ def from_key_and_value(key, value)
           case value
           when /^:/
             "#{key}:`#{value[1..-1]}`"
-          when String
-            "#{key}.#{value}"
-          when Symbol
+          when String, Symbol
             "#{key}:`#{value}`"
           when Array
             value.map do |v|