decorator pkgs: add missing default policy

This prevents spamming the log with false-positive warning messages.
It is related to commit "os/session_policy: warn if no policy exists".

repos/gems/recipes/pkg/motif_decorator/runtime

@@ -4,6 +4,7 @@
 
 	<config>
 		<controls> <maximizer/> <title/> <closer/> </controls>
+		<default-policy/>
 	</config>
 
 	<content>

repos/gems/recipes/pkg/themed_decorator/runtime

@@ -5,6 +5,7 @@
 	<config>
 		<libc/>
 		<vfs> <tar name="plain_decorator_theme.tar"/> </vfs>
+		<default-policy/>
 	</config>
 
 	<content>

repos/gems/recipes/raw/wm/wm.config

@@ -77,6 +77,7 @@
 		<config>
 			<policy label_suffix="decorator -> " role="decorator"/>
 			<policy label_suffix="layouter -> "  role="layouter"/>
+			<default-policy/>
 		</config>
 		<route>
 			<service name="ROM" label="resize_request"> <child name="report_rom"/> </service>

repos/gems/run/tiled_wm.run

@@ -36,6 +36,7 @@ proc qt5_decorator_config { } {
 				</dir>
 			</vfs>
 			<libc/>
+			<default-policy/>
 		</config>}
 }
 

repos/libports/run/qt5_common.inc

@@ -72,6 +72,7 @@ proc qt5_decorator_config { } {
 			</vfs>
 			<libc/>
 			-->
+			<default-policy/>
 		</config>}
 }
 
@@ -160,6 +161,7 @@ proc qt5_start_nodes { feature_arg } {
 			<config>
 				<policy label_prefix="decorator" role="decorator"/>
 				<policy label_prefix="layouter"  role="layouter"/>
+				<default-policy/>
 			</config>
 			<route>
 				<service name="ROM" label="focus">          <child name="wm_report_rom"/> </service>