Refactor inputs height

jet/static/jet/css/_forms.scss

@@ -56,7 +56,7 @@
 input[type="text"], input[type="email"], input[type="password"], input[type="url"], input[type="number"], textarea, select, .vTextField {
   border-radius: 4px;
   font-size: 13px;
-  height: 32px;
+  height: $input-height;
   white-space: nowrap;
   outline: 0;
   box-sizing: border-box;

jet/static/jet/css/_variables.scss

@@ -126,6 +126,7 @@ $background-button-text-color: #6f7e95 !default;
  * Inputs
  */
 
+$input-height: 32px !default;
 $input-background-color: #fff !default;
 $input-contrast-background-color: #d0dbe6 !default;
 $input-border-color: #ecf2f6 !default;

jet/static/jet/css/select2/_layout.scss

@@ -1,7 +1,5 @@
 @import "../globals";
 
-$input-height: 32px;
-
 .select2-container--jet {
   @import "single";
   @import "multiple";
@@ -12,7 +10,6 @@ $input-height: 32px;
     border: 1px solid $input-border-color;
     border-radius: 4px;
     outline: 0;
-    height: $input-height;
 
     @include for-mobile {
       fieldset.module & {

jet/static/jet/css/select2/_multiple.scss

@@ -1,12 +1,10 @@
 @import "../globals";
 
-$input-height: 0 !default;
-
 .select2-selection--multiple {
   background-color: $input-background-color !important;
   border: 1px solid $input-border-color;
   cursor: text;
-  height: auto !important;
+  height: auto;
   min-height: $input-height;
 
   .select2-selection__rendered {

jet/static/jet/css/select2/_single.scss

@@ -1,8 +1,8 @@
 @import "../globals";
 
-$input-height: 0 !default;
-
 .select2-selection--single {
+  height: $input-height;
+
   .select2-selection__clear {
     cursor: pointer;
     float: right;