catch exceptions as const

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9afd25cfb7f22e4e53a1a58c9a7150c25cfe06b6
diff --git a/src/network_manager.cpp b/src/network_manager.cpp
index 4ff8952..4ff9e17 100644
--- a/src/network_manager.cpp
+++ b/src/network_manager.cpp
@@ -95,7 +95,7 @@
             }
         }
     }
-    catch (std::exception& e)
+    catch (const std::exception& e)
     {
         log<level::ERR>("Unable to create the default network file");
     }