Minor adjustments now that OpenGLES 2 is the default driver on Android (#12391)

android/app/src/main/AndroidManifest.xml

@@ -6,6 +6,7 @@
 
 	<uses-permission android:name="android.permission.INTERNET" />
 	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+	<uses-feature android:glEsVersion="0x00020000" />
 
 	<!--
 		`android:requestLegacyExternalStorage="true"` is workaround for using `/sdcard`

builtin/settingtypes.txt

@@ -1649,10 +1649,9 @@ ignore_world_load_errors (Ignore world errors) bool false
 shader_path (Shader path) path
 
 #    The rendering back-end.
-#    A restart is required after changing this.
-#    Note: On Android, stick with OGLES1 if unsure! App may fail to start otherwise.
-#    On other platforms, OpenGL is recommended.
-#    Shaders are supported by OpenGL (desktop only) and OGLES2 (experimental)
+#    Note: A restart is required after changing this!
+#    OpenGL is the default for desktop, and OGLES2 for Android.
+#    Shaders are supported by OpenGL and OGLES2 (experimental).
 video_driver (Video driver) enum opengl opengl,ogles1,ogles2
 
 #    Distance in nodes at which transparency depth sorting is enabled

src/defaultsettings.cpp

@@ -245,11 +245,7 @@ void set_default_settings()
 	settings->setDefault("texture_clean_transparent", "false");
 	settings->setDefault("texture_min_size", "64");
 	settings->setDefault("ambient_occlusion_gamma", "1.8");
-#if ENABLE_GLES
-	settings->setDefault("enable_shaders", "false");
-#else
 	settings->setDefault("enable_shaders", "true");
-#endif
 	settings->setDefault("enable_particles", "true");
 	settings->setDefault("arm_inertia", "true");
 	settings->setDefault("show_nametag_backgrounds", "true");