fix: language warning

Author: iampawan

Diff for: lib/src/flutter/clippers/vx_arc.dart

@@ -27,8 +27,6 @@ class VxArcClipper extends CustomClipper<Path> {
         return _getBottomPath(size);
       case VxEdge.left:
         return _getLeftPath(size);
-      default:
-        return _getRightPath(size);
     }
   }
 

Diff for: lib/src/flutter/clippers/vx_diagonal.dart

@@ -32,8 +32,6 @@ class VxDiagonalClipper extends CustomClipper<Path> {
         return _getBottomLeftPath(size);
       case VxDiagonalPosition.bottomRight:
         return _getBottomRightPath(size);
-      default:
-        return _getBottomLeftPath(size);
     }
   }
 

Diff for: lib/src/flutter/filters.dart

@@ -359,8 +359,6 @@ class VxFilter extends VxWidgetBuilder<Widget> {
       case VxColorFilter.polaroid:
         myMatrix = _polaroid;
         break;
-      default:
-        myMatrix = _noFilter;
     }
     return this;
   }

Diff for: lib/src/flutter/list.dart

@@ -184,8 +184,6 @@ class VxOrderedList extends StatelessWidget {
         return '${_toRomanNumeral(index)}.';
       case VxListType.lowerRoman:
         return '${_toRomanNumeral(index).toLowerCase()}.';
-      default:
-        return '$index.';
     }
   }