Qt: mlt_info parameter is unused

Change-Id: Ie5744d076ae4997bd2252dd66bbc92780ffe73e0
Reviewed-on: https://code.wireshark.org/review/10670
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>

ui/qt/lte_mac_statistics_dialog.cpp

@@ -126,7 +126,7 @@ public:
     }
 
     // TODO: not currently used. Delete?
-    void update(const mac_lte_tap_info *mlt_info _U_) {
+    void update(const mac_lte_tap_info *) {
     }
 
     // TODO: when SR and RACH checkboxes added, check state and add to expression.