configuration: Initial work to reset all settings

This commit does not compile.

Initial work to add and connect a Reset to Defaults button to the
configure_general tab.

Co-authored-by: german77 <juangerman-13@hotmail.com>

src/yuzu/configuration/configure_general.ui

@@ -91,6 +91,13 @@
        </layout>
       </widget>
      </item>
+      <item alignment="Qt::AlignRight">
+        <widget class="QPushButton" name="button_reset_defaults">
+          <property name="text">
+            <string>Reset All Settings</string>
+          </property>
+        </widget>
+      </item>
      <item>
       <spacer name="verticalSpacer">
        <property name="orientation">