fix(gui/mission): 调整任务prefab的布局参数与激活状态

修正了任务界面预制体的位置、尺寸、对齐边距以及默认激活状态，修复界面显示错位问题

assets/resources/gui/element/mission.prefab

@@ -1382,7 +1382,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": -330,
-      "y": 390.888,
+      "y": 372.03,
       "z": 0
     },
     "_lrot": {
@@ -2604,7 +2604,7 @@
         "__id__": 148
       }
     ],
-    "_active": false,
+    "_active": true,
     "_components": [
       {
         "__id__": 156
@@ -2621,8 +2621,8 @@
     },
     "_lpos": {
       "__type__": "cc.Vec3",
-      "x": 0,
+      "x": 259.067,
-      "y": 208.926,
+      "y": 158.268,
       "z": 0
     },
     "_lrot": {
@@ -2715,7 +2715,7 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 720,
+      "width": 510.00000000000006,
       "height": 50
     },
     "_anchorPoint": {
@@ -3166,7 +3166,7 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 720,
+      "width": 510.00000000000006,
       "height": 50
     },
     "_anchorPoint": {
@@ -3236,8 +3236,8 @@
     },
     "_alignFlags": 40,
     "_target": null,
-    "_left": 0,
+    "_left": 4.06699999999995,
-    "_right": 0,
+    "_right": -4.06699999999995,
     "_top": 0,
     "_bottom": 0,
     "_horizontalCenter": 0,
@@ -3316,7 +3316,7 @@
     "_left": 30,
     "_right": 515,
     "_top": 0,
-    "_bottom": 260.888,
+    "_bottom": 242.02999999999997,
     "_horizontalCenter": 0,
     "_verticalCenter": 0,
     "_isAbsLeft": true,