fix: trim the initial sender balance variable

test/bridge-e2e.bats

@@ -79,7 +79,7 @@ setup() {
     # Query for initial sender balance
     run queryContract "$l1_rpc_url" "$gas_token_addr" "$balance_of_fn_sig" "$sender_addr"
     assert_success
-    local gas_token_init_sender_balance=$(echo "$output" | tail -n 1)
+    local gas_token_init_sender_balance=$(echo "$output" | tail -n 1 | awk '{print $1}')
     echo "Initial sender balance $gas_token_init_sender_balance" of gas token on L1 >&3
 
     # Mint gas token on L1
@@ -95,7 +95,11 @@ setup() {
     local gas_token_final_sender_balance=$(echo "$output" |
         tail -n 1 |
         awk '{print $1}')
-    local expected_balance=$(echo "$gas_token_init_sender_balance + $wei_amount" | bc)
+    local expected_balance=$(
+        echo "$gas_token_init_sender_balance + $wei_amount" |
+            bc |
+            awk '{print $1}'
+    )
 
     echo "Sender balance ($sender_addr) (gas token L1): $gas_token_final_sender_balance" >&3
     assert_equal "$gas_token_final_sender_balance" "$expected_balance"