feat: make webgl be default renderer

Author: CyanSalt

addons/settings/locales/zh-CN.json

@@ -61,7 +61,6 @@
   "Renderer Type#!settings.label.terminal.view.rendererType": "渲染方式",
   "Specify how to render the terminal#!settings.comments.0.terminal.view.rendererType": "声明如何渲染终端",
   "Options: 'dom', 'canvas' or 'webgl'#!settings.comments.1.terminal.view.rendererType": "可选项: 'dom', 'canvas' 或 'webgl'",
-  "'webgl' has the best performance but may have display flaws#!settings.comments.2.terminal.view.rendererType": "'webgl' 具有最好的性能，但可能在显示效果上有瑕疵",
   "Frame Type#!settings.label.terminal.view.frameType": "框架类型",
   "Frame type of window#!settings.comments.0.terminal.view.frameType": "窗口的框架类型",
   "Options: 'system', 'system-with-menu' or 'immersive'#!settings.comments.1.terminal.view.frameType": "可选项: '系统', '系统（带菜单）' 或 '沉浸式'",

resources/settings.spec.json

@@ -258,14 +258,13 @@
     "label": "Renderer Type",
     "comments": [
       "Specify how to render the terminal",
-      "Options: 'dom', 'canvas' or 'webgl'",
-      "'webgl' has the best performance but may have display flaws"
+      "Options: 'dom', 'canvas' or 'webgl'"
     ],
     "schema": {
       "type": "string",
       "enum": ["dom", "canvas", "webgl"]
     },
-    "default": "canvas"
+    "default": "webgl"
   },
   {
     "key": "terminal.view.frameType",