Fix control extend

sass/components/pagination.sass

@@ -54,7 +54,7 @@ $pagination-shadow-inset: inset 0 1px 2px rgba($black, 0.2)
 .pagination-next,
 .pagination-link,
 .pagination-ellipsis
-  +control
+  @extend %control
   @extend %unselectable
   font-size: 1em
   padding-left: 0.5em

sass/elements/button.sass

@@ -41,7 +41,7 @@ $button-static-border-color: $grey-lighter !default
   font-size: $size-large
 
 .button
-  +control
+  @extend %control
   @extend %unselectable
   background-color: $button-background-color
   border-color: $button-border-color

sass/elements/form.sass

@@ -42,7 +42,7 @@ $label-weight: $weight-bold !default
 $help-size: $size-small !default
 
 =input
-  +control
+  @extend %control
   background-color: $input-background-color
   border-color: $input-border-color
   color: $input-color
@@ -363,7 +363,7 @@ $help-size: $size-small !default
 
 .file-cta,
 .file-name
-  +control
+  @extend %control
   border-color: $file-border-color
   border-radius: $file-radius
   font-size: 1em

sass/utilities/controls.sass

@@ -9,7 +9,7 @@ $control-line-height: 1.5 !default
 $control-padding-vertical: calc(0.375em - #{$control-border-width}) !default
 $control-padding-horizontal: calc(0.625em - #{$control-border-width}) !default
 
-%control
+=control
   -moz-appearance: none
   -webkit-appearance: none
   align-items: center
@@ -36,8 +36,8 @@ $control-padding-horizontal: calc(0.625em - #{$control-border-width}) !default
   &[disabled]
     cursor: not-allowed
 
-=control
+%control
-  @extend %control
+  +control
 
 // The controls sizes use mixins so they can be used at different breakpoints
 =control-small