User proper ellipsis char

As stated in
https://github.com/profanity-im/profanity/pull/1820#issuecomment-1498083383
profanity uses "..." (three dots) in a lot of places instead the proper
ellipsis char "…".

src/xmpp/connection.c

@@ -414,7 +414,7 @@ _register_handle_features(xmpp_conn_t* xmpp_conn, xmpp_stanza_t* stanza, void* u
     /* secure connection if possible */
     child = xmpp_stanza_get_child_by_name(stanza, "starttls");
     if (child && (strcmp(xmpp_stanza_get_ns(child), XMPP_NS_TLS) == 0)) {
-        log_debug("Server supports TLS. Attempting to establish...");
+        log_debug("Server supports TLS. Attempting to establish…");
         child = xmpp_stanza_new(ctx);
         xmpp_stanza_set_name(child, "starttls");
         xmpp_stanza_set_ns(child, XMPP_NS_TLS);

src/xmpp/iq.c

@@ -2596,7 +2596,7 @@ static int
 _mam_buffer_commit_handler(xmpp_stanza_t* const stanza, void* const userdata)
 {
     ProfChatWin* chatwin = (ProfChatWin*)userdata;
-    // Remove the "Loading messages ..." message
+    // Remove the "Loading messages …" message
     buffer_remove_entry(((ProfWin*)chatwin)->layout->buffer, 0);
     chatwin_db_history(chatwin, NULL, NULL, TRUE);
     return 0;

src/xmpp/ox.c

@@ -91,7 +91,7 @@ ox_announce_public_key(const char* const filename)
 {
     assert(filename);
 
-    cons_show("Announce OpenPGP Key for OX %s ...", filename);
+    cons_show("Announce OpenPGP Key for OX %s …", filename);
     log_info("[OX] Announce OpenPGP Key of OX: %s", filename);
 
     // key the key and the fingerprint via GnuPG from file