Silence misleading exception print in setQtContextDelegate

As I understand it, the call to getDeclaredMethod seems to be just there
to check if a given method is declared under before adding it to the
delegates list, and that's why the getDeclaredMethod is not returning
anything, so we could treat it as a failed check and not print anything.

This is an amendment to 80f7494e8a which
added this print.

Pick-to: 6.1 5.15
Change-Id: I5f69ed5b4fa655da53ac7fba20d4e07acc75607a
Reviewed-by: Andy Shaw <andy.shaw@qt.io>

src/android/java/src/org/qtproject/qt/android/bindings/QtApplication.java

@@ -102,9 +102,7 @@ public class QtApplication extends Application
                         }
                     }
                 }
-            } catch (Exception e) {
-                e.printStackTrace();
-            }
+            } catch (Exception e) { }
         }
     }