Revert "solana/token_bridge: check balance and truncation"

Revert submission 1325

Reason for revert: not supporting external mints
Reverted Changes:
I2bf59ecd3:solana/token_bridge: calculate diff from original ...
I598373740:solana/token_bridge: check balance and truncation
I67c7a1c7a:solana/token_bridge: test wrapped asset transfers

Change-Id: I05a950e3142e0386351a67fc7d051000f3481c8b

solana/modules/token_bridge/program/tests/integration.rs

@@ -43,7 +43,7 @@ use solitaire::{
     processors::seeded::Seeded,
     AccountState,
 };
-use spl_token::state::{Account, Mint};
+use spl_token::state::Mint;
 use std::{
     convert::TryInto,
     io::{
@@ -794,19 +794,6 @@ fn test_transfer_in_wrapped_preexisting(context: &mut Context) {
         payer,
     )
     .unwrap();
-
-    let account_data = Account::unpack(
-        &client
-            .get_account_with_commitment(&external_token_account.pubkey(), CommitmentConfig::processed())
-            .unwrap()
-            .value
-            .unwrap()
-            .data,
-    )
-    .unwrap();
-
-    // Check truncation for external asset shrinks by the correct amount.
-    assert_eq!(1000, account_data.amount);
 }
 
 fn test_transfer_wrapped_preexisting(context: &mut Context) {