Change _PHOSPHOR_WEBUI to _STATIC_HOSTING

Changing this config option to better represent what it
does, which is to host the static files from /usr/share/www/

Change-Id: Iaf785666f59f937567b6d0319c884c8ed29d2844
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/src/webserver_main.cpp b/src/webserver_main.cpp
index e2a776a..2f89ad4 100644
--- a/src/webserver_main.cpp
+++ b/src/webserver_main.cpp
@@ -61,7 +61,7 @@
   // Static assets need to be initialized before Authorization, because auth
   // needs to build the whitelist from the static routes
 
-#ifdef BMCWEB_ENABLE_PHOSPHOR_WEBUI
+#ifdef BMCWEB_ENABLE_STATIC_HOSTING
   crow::webassets::requestRoutes(app);
 #endif