fix placeholder typo in vendor prefix for IE

src/definitions/collections/form.less

@@ -322,7 +322,7 @@
 .ui.form ::-webkit-input-placeholder {
   color: @inputPlaceholderColor;
 }
-.ui.form ::-ms-input-placeholder {
+.ui.form :-ms-input-placeholder {
   color: @inputPlaceholderColor;
 }
 .ui.form ::-moz-placeholder {
@@ -332,7 +332,7 @@
 .ui.form :focus::-webkit-input-placeholder {
   color: @inputPlaceholderFocusColor;
 }
-.ui.form :focus::-ms-input-placeholder {
+.ui.form :focus:-ms-input-placeholder {
   color: @inputPlaceholderFocusColor;
 }
 .ui.form :focus::-moz-placeholder {
@@ -343,7 +343,7 @@
 .ui.form .error ::-webkit-input-placeholder {
   color: @inputErrorPlaceholderColor;
 }
-.ui.form .error ::-ms-input-placeholder {
+.ui.form .error :-ms-input-placeholder {
   color: @inputErrorPlaceholderColor;
 }
 .ui.form .error ::-moz-placeholder {
@@ -353,7 +353,7 @@
 .ui.form .error :focus::-webkit-input-placeholder {
   color: @inputErrorPlaceholderFocusColor;
 }
-.ui.form .error :focus::-ms-input-placeholder {
+.ui.form .error :focus:-ms-input-placeholder {
   color: @inputErrorPlaceholderFocusColor;
 }
 .ui.form .error :focus::-moz-placeholder {

src/definitions/elements/input.less

@@ -69,7 +69,7 @@
 .ui.input input::-moz-placeholder {
   color: @placeholderColor;
 }
-.ui.input input::-ms-input-placeholder {
+.ui.input input:-ms-input-placeholder {
   color: @placeholderColor;
 }
 
@@ -162,8 +162,8 @@
 .ui.input input:focus::-moz-placeholder {
   color: @placeholderFocusColor;
 }
-.ui.input.focus input::-ms-input-placeholder,
-.ui.input input:focus::-ms-input-placeholder {
+.ui.input.focus input:-ms-input-placeholder,
+.ui.input input:focus:-ms-input-placeholder {
   color: @placeholderFocusColor;
 }
 
@@ -187,7 +187,7 @@
 .ui.input.error input::-moz-placeholder {
   color: @placeholderErrorColor;
 }
-.ui.input.error input::-ms-input-placeholder {
+.ui.input.error input:-ms-input-placeholder {
   color: @placeholderErrorColor;
 }
 
@@ -198,7 +198,7 @@
 .ui.input.error input:focus::-moz-placeholder {
   color: @placeholderErrorFocusColor;
 }
-.ui.input.error input:focus::-ms-input-placeholder {
+.ui.input.error input:focus:-ms-input-placeholder {
   color: @placeholderErrorFocusColor;
 }
 
@@ -245,7 +245,7 @@
 .ui.transparent.inverted.input input::-moz-placeholder {
   color: @transparentInvertedPlaceholderColor;
 }
-.ui.transparent.inverted.input input::-ms-input-placeholder {
+.ui.transparent.inverted.input input:-ms-input-placeholder {
   color: @transparentInvertedPlaceholderColor;
 }