Simplify error handling in BinaryTable by removing unused exception variable

cpp/binary_table.cpp

@@ -656,7 +656,7 @@ std::unordered_map<int64_t, BT_Pointer> BinaryTable::getAddressTable() {
         }
         
         return addressTable;
-    } catch (const std::runtime_error& e) {
+    } catch (const std::runtime_error&) {
         // Re-throw runtime errors (our validation failures)
         throw;
     } catch (...) {