[Backport] Fix typo in input type variable name

Author: dmytro-ch

app/code/Magento/CatalogSearch/Block/Advanced/Form.php

@@ -197,16 +197,16 @@ public function getCurrency($attribute)
     public function getAttributeInputType($attribute)
     {
         $dataType = $attribute->getBackend()->getType();
-        $imputType = $attribute->getFrontend()->getInputType();
-        if ($imputType == 'select' || $imputType == 'multiselect') {
+        $inputType = $attribute->getFrontend()->getInputType();
+        if ($inputType == 'select' || $inputType == 'multiselect') {
             return 'select';
         }
 
-        if ($imputType == 'boolean') {
+        if ($inputType == 'boolean') {
             return 'yesno';
         }
 
-        if ($imputType == 'price') {
+        if ($inputType == 'price') {
             return 'price';
         }