Fix CvPcb menu accelerator bug in Linux. (fixes lp:1375232)

cvpcb/class_components_listbox.cpp

@@ -168,6 +168,8 @@ void COMPONENTS_LISTBOX::OnChar( wxKeyEvent& event )
             break;
         }
     }
+
+    event.Skip();
 }
 
 

cvpcb/class_footprints_listbox.cpp

@@ -286,4 +286,6 @@ void FOOTPRINTS_LISTBOX::OnChar( wxKeyEvent& event )
             break;
         }
     }
+
+    event.Skip();
 }

cvpcb/class_library_listbox.cpp

@@ -213,6 +213,8 @@ void LIBRARY_LISTBOX::OnChar( wxKeyEvent& event )
             break;
         }
     }
+
+    event.Skip();
 }