GUACAMOLE-2139: Do not exclude non-templated resources from packaging.

This corrects the issue introduced by commit 10f606c which caused
resources to be inadvertently excluded, including the database mapper
XML files.

pom.xml

@@ -559,6 +559,9 @@
             </activation>
             <build>
                 <resources>
+                    <resource>
+                        <directory>src/main/resources</directory>
+                    </resource>
                     <resource>
                         <directory>src/main/resource-templates</directory>
                         <filtering>true</filtering>