Trim all space/dots from end

Depending on whether can read the AVD (or it even has all fields populated) we might get extra "empty" columns, so this trims all blank cells from the end.

packages/flutter_tools/lib/src/emulator.dart

@@ -123,11 +123,14 @@ abstract class Emulator {
     }
 
     // Join columns into lines of text
+    final RegExp whiteSpaceAndDots = new RegExp(r'[•\s]+$');
     return table.map((List<String> row) {
       return indices
         .map((int i) => row[i].padRight(widths[i]))
-        .join(' • ') + (row.last != '' ? ' • ${row.last}' : '');
-    }).toList();
+        .join(' • ') + ' • ${row.last}';
+    })
+        .map((String line) => line.replaceAll(whiteSpaceAndDots, ''))
+        .toList();
   }
 
   static void printEmulators(List<Emulator> emulators) {