Remove remaining static inline styles from user crypto settings

Convert two remaining style="width: 100%;" declarations to use existing
full-width-input CSS class. This completes the cleanup of all static
inline styles, leaving only 2 dynamic inline styles remaining across
the entire template codebase.

File updated:
- user_crypto_settings.j2: Crypto address and label input fields

Remaining inline styles: 2 (both dynamic/business-critical)

make_post_sell/templates/user_crypto_settings.j2

@@ -23,10 +23,9 @@
             name        = "address"
             type        = "text"
             id          = "{{ coin.lower() }}_address_input"
-            class       = "mps-crypto-address"
+            class       = "mps-crypto-address full-width-input"
             value       = "{% if addresses.get(coin) %}{{ addresses[coin].address }}{% endif %}"
             placeholder = "Your {{ coin }} address for automatic refunds"
-            style       = "width: 100%;"
             />
         
         <br />
@@ -36,10 +35,9 @@
             name        = "label"
             type        = "text"
             id          = "{{ coin.lower() }}_label_input"
-            class       = "mps-crypto-label"
+            class       = "mps-crypto-label full-width-input"
             value       = "{% if addresses.get(coin) %}{{ addresses[coin].label }}{% endif %}"
             placeholder = "e.g., My Hardware Wallet"
-            style       = "width: 100%;"
             />
         
         <br />