Do not equalize field height when screen size is lesser than 700px

After the forms are being condensed in mobile view, it should stop
equalising the height of the fields as it has only 1 field per row.

gridforms/gridforms.js

@@ -44,7 +44,7 @@ jQuery(function($) {
             var that = this;
             that.el.fieldsContainers.click(function(event) {
                 var focusableFields = that.el.focusableFields.selector;
-                
+
                 if (!$(event.target).is(focusableFields)) {
                     $(this).find('input[type="text"],input[type="number"],input[type="tel"],input[type="email"], textarea, select').first().focus();
                 }
@@ -66,11 +66,11 @@ jQuery(function($) {
             var fieldsRows = this.el.fieldsRows;
             var fieldsContainers = this.el.fieldsContainers;
 
-            // Make sure that the fields aren't stacked
-            if (!this.areFieldsStacked()) {
+            // Make sure that the fields aren't stacked and window width is more than 700px
+            if (!this.areFieldsStacked() && $(window).width() > 700) {
                 fieldsRows.filter(":visible").each(function() {
                     var fieldRow = $(this);
-                    
+
                     // Singleton textarea rows should determine their row height
                     var rowInputs = fieldRow.children();
                     if (rowInputs.length === 1 && rowInputs.children("textarea").length === 1) return;
@@ -84,13 +84,13 @@ jQuery(function($) {
             }
         },
         areFieldsStacked: function() {
-            // Get the first row 
-            // which does not only contain one field 
+            // Get the first row
+            // which does not only contain one field
             var firstRow = this.el.fieldsRows
                 .not('[data-row-span="1"]')
                 .first();
 
-            // Get to the total width 
+            // Get to the total width
             // of each field witin the row
             var totalWidth = 0;
             firstRow.children().each(function() {