[3.1.190618-rc2] HTLC - Incorrect information about fee

**Describe the bug**
Incorrect information about fee when create or extend HTLC

**To Reproduce**
Steps to reproduce the behavior:
1. Go to [HTLC](https://staging.bitshares.org/#/htlc)
2. Click on 'Create HTLC'
3. Fill out the forms
4. Click on 'Create'
5. See the difference between fee in the form of create or extend HTLC and in the form of confirming the transaction

**Expected behavior**
See the identical information about fees

**Screenshots**

**Desktop:**
- Windows 10
- Browser: Firefox 67.0.4

**Additional context**
Need to dynamically update information about the fee, if conditions change that affect its value.