Revert "border-radius only for first and last input"

If input fields are not close enough to each other, it looks weird. Also
it didn't work in mobile view.

This reverts commit 77d40a99eb.

isso/css/isso.css

@@ -178,19 +178,12 @@
 .isso-postbox > .form-wrapper > .auth-section .input-wrapper input {
     padding: .3em 10px;
     max-width: 100%;
+    border-radius: 3px;
     background-color: #fff;
     line-height: 1.4em;
     border: 1px solid rgba(0, 0, 0, 0.2);
     box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
 }
-.isso-postbox > .form-wrapper > .auth-section .input-wrapper:first-child input {
-    border-radius: 3px 0 0 3px;
-    border-right: 0;
-}
-.isso-postbox > .form-wrapper > .auth-section .input-wrapper:nth-last-child(2) input {
-    border-radius: 0 3px 3px 0;
-    border-left: 0;
-}
 .isso-postbox > .form-wrapper > .auth-section .post-action {
     display: inline-block;
     float: right;
@@ -220,7 +213,6 @@
     }
     .isso-postbox > .form-wrapper > .auth-section .input-wrapper input {
         width: 100%;
-        border-radius: 3px;
     }
     .isso-postbox > .form-wrapper > .auth-section .post-action {
         display: block;