info: changed xmp tag style

lib/widgets/fullscreen/info/xmp_section.dart

@@ -9,6 +9,8 @@ class XmpTagSectionSliver extends AnimatedWidget {
   final ImageCollection collection;
   final ImageEntry entry;
 
+  static const double buttonBorderWidth = 2;
+
   XmpTagSectionSliver({
     Key key,
     @required this.collection,
@@ -24,13 +26,16 @@ class XmpTagSectionSliver extends AnimatedWidget {
             ? []
             : [
                 const SectionRow('XMP Tags'),
-                Wrap(
+                Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: buttonBorderWidth / 2),
+                  child: Wrap(
                     spacing: 8,
                     children: tags
                         .map((tag) => OutlineButton(
                               onPressed: () => _goToTag(context, tag),
                               borderSide: BorderSide(
                                 color: stringToColor(tag),
+                                width: buttonBorderWidth,
                               ),
                               shape: RoundedRectangleBorder(
                                 borderRadius: BorderRadius.circular(42),
@@ -39,6 +44,7 @@ class XmpTagSectionSliver extends AnimatedWidget {
                             ))
                         .toList(),
                   ),
+                ),
               ],
       ),
     );