Fix dialogue box related bugs

Assets/Animations/DialogueBox_Open.anim

@@ -142,6 +142,25 @@ AnimationClip:
     path: Text Bubble
     classID: 114
     script: {fileID: 11500000, guid: 1344c3c82d62a2a41a3576d8abb8e3ea, type: 3}
+  - curve:
+      serializedVersion: 2
+      m_Curve:
+      - serializedVersion: 3
+        time: 0
+        value: 1
+        inSlope: Infinity
+        outSlope: Infinity
+        tangentMode: 103
+        weightedMode: 0
+        inWeight: 0
+        outWeight: 0
+      m_PreInfinity: 2
+      m_PostInfinity: 2
+      m_RotationOrder: 4
+    attribute: m_IsActive
+    path: Character Text
+    classID: 1
+    script: {fileID: 0}
   m_PPtrCurves: []
   m_SampleRate: 60
   m_WrapMode: 0
@@ -185,6 +204,13 @@ AnimationClip:
       typeID: 114
       customType: 24
       isPPtrCurve: 0
+    - serializedVersion: 2
+      path: 983765927
+      attribute: 2086281974
+      script: {fileID: 0}
+      typeID: 1
+      customType: 0
+      isPPtrCurve: 0
     pptrCurveMapping: []
   m_AnimationClipSettings:
     serializedVersion: 2
@@ -450,6 +476,25 @@ AnimationClip:
     path: Text Bubble
     classID: 114
     script: {fileID: 11500000, guid: 1344c3c82d62a2a41a3576d8abb8e3ea, type: 3}
+  - curve:
+      serializedVersion: 2
+      m_Curve:
+      - serializedVersion: 3
+        time: 0
+        value: 1
+        inSlope: Infinity
+        outSlope: Infinity
+        tangentMode: 103
+        weightedMode: 0
+        inWeight: 0
+        outWeight: 0
+      m_PreInfinity: 2
+      m_PostInfinity: 2
+      m_RotationOrder: 4
+    attribute: m_IsActive
+    path: Character Text
+    classID: 1
+    script: {fileID: 0}
   m_EulerEditorCurves: []
   m_HasGenericRootTransform: 0
   m_HasMotionFloatCurves: 0