Preface all LayerSurface namespaces with "phosh"

This makes sure our rootston extension can find it. Name the panel
itself "phosh" since this surface's output is being rotated.

src/home.c

@@ -100,6 +100,6 @@ phosh_home_new (struct zwlr_layer_shell_v1 *layer_shell,
                        "layer", ZWLR_LAYER_SHELL_V1_LAYER_TOP,
                        "kbd-interactivity", FALSE,
                        "exclusive-zone", PHOSH_HOME_HEIGHT,
-                       "namespace", "home",
+                       "namespace", "phosh home",
                        NULL);
 }

src/lockscreen.c

@@ -357,6 +357,6 @@ phosh_lockscreen_new (gpointer layer_shell,
                        "layer", ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY,
                        "kbd-interactivity", TRUE,
                        "exclusive-zone", -1,
-                       "namespace", "lockscreen",
+                       "namespace", "phosh lockscreen",
                        NULL);
 }

src/lockshield.c

@@ -99,6 +99,6 @@ phosh_lockshield_new (gpointer layer_shell,
                        "layer", ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY,
                        "kbd-interactivity", FALSE,
                        "exclusive-zone", -1,
-                       "namespace", "lockshield",
+                       "namespace", "phosh lockshield",
                        NULL);
 }

src/panel.c

@@ -200,7 +200,7 @@ phosh_panel_new (struct zwlr_layer_shell_v1 *layer_shell,
                        "layer", ZWLR_LAYER_SHELL_V1_LAYER_TOP,
                        "kbd-interactivity", FALSE,
                        "exclusive-zone", PHOSH_PANEL_HEIGHT,
-                       "namespace", "panel",
+                       "namespace", "phosh",
                        NULL);
 }