简化自定义模式选项，移除部分不必要的参数

parts/language/lang_symbol.lua

@@ -281,13 +281,6 @@ return{
 			nextCount="→",
 			holdCount="[ ]",
 			infHold="∞*[ ]",
-			block="==↓==",
-			ghost="__↓__",
-			center="+",
-			upEdge="[]`",
-			bagLine="123|123",
-			highCam="↑__↑",
-			nextPos="???←",
 			bone="[]",
 
 			mindas="mDAS",
@@ -295,7 +288,6 @@ return{
 			minsdarr="msdARR",
 			noTele="X→→X",
 			fieldH="↑[]↓",
-			RS="''?",
 			ospin="O→Any",
 			deepDrop="\\↓↓/",
 			target="&=",