video_filter_puzzle: change default value and limit ([2, 16] is really enough

and 4 is good as a default value)

modules/gui/qt4/ui/video_effects.ui

@@ -362,7 +362,7 @@
           <number>16</number>
          </property>
          <property name="value" >
-          <number>3</number>
+          <number>4</number>
          </property>
         </widget>
        </item>
@@ -375,7 +375,7 @@
           <number>16</number>
          </property>
          <property name="value" >
-          <number>3</number>
+          <number>4</number>
          </property>
         </widget>
        </item>

modules/video_filter/puzzle.c

@@ -58,9 +58,9 @@ vlc_module_begin()
     set_category( CAT_VIDEO )
     set_subcategory( SUBCAT_VIDEO_VFILTER )
 
-    add_integer_with_range( CFG_PREFIX "rows", 4, 1, 128, NULL,
+    add_integer_with_range( CFG_PREFIX "rows", 4, 2, 16, NULL,
                             ROWS_TEXT, ROWS_LONGTEXT, false )
-    add_integer_with_range( CFG_PREFIX "cols", 4, 1, 128, NULL,
+    add_integer_with_range( CFG_PREFIX "cols", 4, 2, 16, NULL,
                             COLS_TEXT, COLS_LONGTEXT, false )
     add_bool( CFG_PREFIX "black-slot", false, NULL,
               BLACKSLOT_TEXT, BLACKSLOT_LONGTEXT, false )