Small improvement

app/src/main/java/eu/faircode/email/FragmentOptionsMisc.java

@@ -1590,7 +1590,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
         btnGC.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                Helper.gc();
+                Helper.gc(true);
                 DB.shrinkMemory(v.getContext());
             }
         });