UI: Use property split in UV editor panels

This is not an exhaustive change, just for the 2D cursor and
UDIM grid properties. Also vertically align the "UV Vertex"
buttons like in the 3D view panels.

source/blender/editors/uvedit/uvedit_buttons.c

@@ -137,7 +137,6 @@ static void uvedit_vertex_buttons(const bContext *C, uiBlock *block)
   Scene *scene = CTX_data_scene(C);
   float center[2];
   int imx, imy, step, digits;
-  float width = 8 * UI_UNIT_X;
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
       CTX_data_view_layer(C), CTX_wm_view3d(C), &objects_len);
@@ -177,14 +176,15 @@ static void uvedit_vertex_buttons(const bContext *C, uiBlock *block)
 
     uiBut *but;
 
+    int y = 0;
     UI_block_align_begin(block);
     but = uiDefButF(block,
                     UI_BTYPE_NUM,
                     B_UVEDIT_VERTEX,
                     IFACE_("X:"),
                     0,
-                    0,
-                    width,
+                    y -= UI_UNIT_Y,
+                    200,
                     UI_UNIT_Y,
                     &uvedit_old_center[0],
                     UNPACK2(range_xy[0]),
@@ -197,9 +197,9 @@ static void uvedit_vertex_buttons(const bContext *C, uiBlock *block)
                     UI_BTYPE_NUM,
                     B_UVEDIT_VERTEX,
                     IFACE_("Y:"),
-                    width,
                     0,
-                    width,
+                    y -= UI_UNIT_Y,
+                    200,
                     UI_UNIT_Y,
                     &uvedit_old_center[1],
                     UNPACK2(range_xy[1]),