Delete increase_message_fee

[boundless-forest]

Fix #205

Please note this will change the receive_messages_proof and receive_messages_delivery_proof's call index, that's an incompatible change for bridges. A manual upgrade is required after the runtime upgrade.

@fewensa I'll let you know when these changes are included in the runtime release afterward.

[aurexav]

Could you rebase this PR? @AsceticBear

[boundless-forest]

Could you rebase this PR? @AsceticBear

Give me mins.

[boundless-forest]

   Checking sp-state-machine v0.12.0 (https://github.com/paritytech/substrate?branch=master#57e3486d)
error: `sp_trie::recorder::Recorder<H>::as_trie_recorder::{opaque#0}<'_>` does not live long enough
   --> /home/bear/.cargo/git/checkouts/substrate-7e08433d4c370a21/57e3486/primitives/state-machine/src/trie_backend_essence.rs:181:44
    |
181 |         let recorder = recorder.as_mut().map(|r| r as _);
    |                                                  ^

error: `sp_trie::recorder::Recorder<H>::as_trie_recorder::{opaque#0}<'_>` does not live long enough
   --> /home/bear/.cargo/git/checkouts/substrate-7e08433d4c370a21/57e3486/primitives/state-machine/src/trie_backend_essence.rs:219:44
    |
219 |         let recorder = recorder.as_mut().map(|r| r as _);
    |                                                  ^

There is still a compile issue in your branch. @AurevoirXavier

[aurexav]

   Checking sp-state-machine v0.12.0 (https://github.com/paritytech/substrate?branch=master#57e3486d)
error: `sp_trie::recorder::Recorder<H>::as_trie_recorder::{opaque#0}<'_>` does not live long enough
   --> /home/bear/.cargo/git/checkouts/substrate-7e08433d4c370a21/57e3486/primitives/state-machine/src/trie_backend_essence.rs:181:44
    |
181 |         let recorder = recorder.as_mut().map(|r| r as _);
    |                                                  ^

error: `sp_trie::recorder::Recorder<H>::as_trie_recorder::{opaque#0}<'_>` does not live long enough
   --> /home/bear/.cargo/git/checkouts/substrate-7e08433d4c370a21/57e3486/primitives/state-machine/src/trie_backend_essence.rs:219:44
    |
219 |         let recorder = recorder.as_mut().map(|r| r as _);
    |                                                  ^

There is still a compile issue in your branch. @AurevoirXavier

I could pass all the tests locally.