Clear crash count

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

@@ -611,6 +611,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
             public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
                 prefs.edit()
                         .remove("crash_reports_asked")
+                        .remove("crash_report_count")
                         .putBoolean("crash_reports", checked)
                         .apply();
                 Log.setCrashReporting(checked);