remove Plugin option from preferences because it mostly brings up an empty screen only.

Author: PhilippC

src/keepass2android-app/Manifests/AndroidManifest_net.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-      android:versionCode="245"
-      android:versionName="1.14-r3"
+      android:versionCode="246"
+      android:versionName="1.14-r4"
       package="keepass2android.keepass2android"
       xmlns:tools="http://schemas.android.com/tools"
       android:installLocation="auto">

src/keepass2android-app/Manifests/AndroidManifest_nonet.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-      android:versionCode="245"
-      android:versionName="1.14-r3"
+      android:versionCode="246"
+      android:versionName="1.14-r4"
       package="keepass2android.keepass2android_nonet"
       xmlns:tools="http://schemas.android.com/tools"
       android:installLocation="auto">

src/keepass2android-app/Resources/xml/preferences.xml

@@ -38,12 +38,6 @@ Keepassdroid, Copyright Brian Pellin.
     android:title="@string/application"
     android:summary="@string/application_settings" />
 
-
-  <Preference android:key="plugin_key" android:title="@string/plugins" app:iconSpaceReserved="false">
-    
-    <intent android:action="kp2a.action.PluginListActivity" />
-  </Preference>
-
   <Preference
     app:iconSpaceReserved="false"
     android:key="@string/about_prefs_key"