GPencil Tools: Fix timeline scrub snap

Due to API change, timeline scrub snapping crashed when setting scene frame

greasepencil_tools/__init__.py

@@ -4,7 +4,7 @@ bl_info = {
 "name": "Grease Pencil Tools",
 "description": "Extra tools for Grease Pencil",
 "author": "Samuel Bernou, Antonio Vazquez, Daniel Martinez Lara, Matias Mendiola",
-"version": (1, 5, 6),
+"version": (1, 5, 7),
 "blender": (2, 91, 0),
 "location": "Sidebar > Grease Pencil > Grease Pencil Tools",
 "warning": "",

greasepencil_tools/timeline_scrub.py

@@ -21,13 +21,13 @@ from bpy.props import (BoolProperty,
                        EnumProperty)
 
 
-def nearest(array, value):
+def nearest(array, value) -> int:
     '''
     Get a numpy array and a target value
     Return closest val found in array to passed value
     '''
     idx = (np.abs(array - value)).argmin()
-    return array[idx]
+    return int(array[idx])
 
 
 def draw_callback_px(self, context):