Add libera.chat to default room directory

Signed-off-by: Aaron Raimist <aaron@raim.ist>

element.io/app/config.json

@@ -21,7 +21,8 @@
     "roomDirectory": {
         "servers": [
             "matrix.org",
-            "gitter.im"
+            "gitter.im",
+            "libera.chat"
         ]
     },
     "enable_presence_by_hs_url": {

element.io/develop/config.json

@@ -21,7 +21,8 @@
     "roomDirectory": {
         "servers": [
             "matrix.org",
-            "gitter.im"
+            "gitter.im",
+            "libera.chat"
         ]
     },
     "enable_presence_by_hs_url": {