Corrected total images label size

When the total number of images became more than 100, the total number was shown as 10 (only two digits) , hence reduced the font size to facilitate showing 3 digits in the number of images.

Author: ganeshsp1

flutter-app/lib/labelscreen.dart

@@ -501,7 +501,12 @@ class LabelEntry extends StatelessWidget {
                         Chip(
                           avatar: CircleAvatar(
                             backgroundColor: Colors.grey.shade800,
-                            child: Text('$totalImages'),
+                            child: Text(
+                              '$totalImages',
+                              style: TextStyle(
+                                fontSize: 12,
+                              ),
+                            ),
                           ),
                           label: Text(totalImages == 1 ? 'image' : 'images'),
                           backgroundColor: Colors.white24,