fix(form): action input had wrong border radius in some cases

.ui.input in .ui.form has border-radius at all corners.

Fomantic-UI/src/definitions/collections/form.less
Line 411 in 2f3312f
 border-radius: @inputFocusBorderRadius; 

Unfortunately, this override brings border-radius to .ui.action.input.
This PR removes border-radius from .ui.action.input in .ui.form where radius not needed.

Closes #1184, #1185

src/definitions/collections/form.less

@@ -413,6 +413,39 @@
   background: @inputFocusBackground;
   box-shadow: @inputFocusBoxShadow;
 }
+& when (@variationInputAction) {
+  .ui.form .ui.action.input:not(.left) input:not([type]):focus,
+  .ui.form .ui.action.input:not(.left) input[type="date"]:focus,
+  .ui.form .ui.action.input:not(.left) input[type="datetime-local"]:focus,
+  .ui.form .ui.action.input:not(.left) input[type="email"]:focus,
+  .ui.form .ui.action.input:not(.left) input[type="number"]:focus,
+  .ui.form .ui.action.input:not(.left) input[type="password"]:focus,
+  .ui.form .ui.action.input:not(.left) input[type="search"]:focus,
+  .ui.form .ui.action.input:not(.left) input[type="tel"]:focus,
+  .ui.form .ui.action.input:not(.left) input[type="time"]:focus,
+  .ui.form .ui.action.input:not(.left) input[type="text"]:focus,
+  .ui.form .ui.action.input:not(.left) input[type="file"]:focus,
+  .ui.form .ui.action.input:not(.left) input[type="url"]:focus {
+    border-top-right-radius: 0;
+    border-bottom-right-radius: 0;
+  }
+
+  .ui.form .ui.action.input.left input:not([type]),
+  .ui.form .ui.action.input.left input[type="date"],
+  .ui.form .ui.action.input.left input[type="datetime-local"],
+  .ui.form .ui.action.input.left input[type="email"],
+  .ui.form .ui.action.input.left input[type="number"],
+  .ui.form .ui.action.input.left input[type="password"],
+  .ui.form .ui.action.input.left input[type="search"],
+  .ui.form .ui.action.input.left input[type="tel"],
+  .ui.form .ui.action.input.left input[type="time"],
+  .ui.form .ui.action.input.left input[type="text"],
+  .ui.form .ui.action.input.left input[type="file"],
+  .ui.form .ui.action.input.left input[type="url"] {
+    border-bottom-left-radius: 0;
+    border-top-left-radius: 0;
+  }
+}
 .ui.form textarea:focus {
   color: @textAreaFocusColor;
   border-color: @textAreaFocusBorderColor;