Fix import filters

Author: Scriptbash

plugin_exporter/plugin_exporter_dialog_base.ui

@@ -79,7 +79,7 @@
          <bool>false</bool>
         </property>
         <property name="filter">
-         <string>*.csv;*.json</string>
+         <string>*.csv *.json</string>
         </property>
        </widget>
       </item>