[ruby/prism] Eliminate character class duplicated range warning

https://github.com/ruby/prism/commit/da939bbd4e

test/prism/fixtures/regex.txt

@@ -19,8 +19,8 @@ foo /bar/
 %r/[a-z$._?][\w$.?#@~]*/i
 
 %r(
-(?:[\w#$%_']|\(\)|\(,\)|\[\]|[0-9])*
-  (?:[\w#$%_']+)
+(?:[#$%_']|\(\)|\(,\)|\[\]|[0-9])*
+  (?:[#$%_']+)
 )
 
 /(?#\))/ =~ "hi"

test/prism/snapshots/regex.txt

@@ -153,9 +153,9 @@
         ├── @ RegularExpressionNode (location: (21,0)-(24,1))
         │   ├── flags: forced_us_ascii_encoding
         │   ├── opening_loc: (21,0)-(21,3) = "%r("
-        │   ├── content_loc: (21,3)-(24,0) = "\n(?:[\\w\#$%_']|\\(\\)|\\(,\\)|\\[\\]|[0-9])*\n  (?:[\\w\#$%_']+)\n"
+        │   ├── content_loc: (21,3)-(24,0) = "\n(?:[\#$%_']|\\(\\)|\\(,\\)|\\[\\]|[0-9])*\n  (?:[\#$%_']+)\n"
         │   ├── closing_loc: (24,0)-(24,1) = ")"
-        │   └── unescaped: "\n(?:[\\w\#$%_']|\\(\\)|\\(,\\)|\\[\\]|[0-9])*\n  (?:[\\w\#$%_']+)\n"
+        │   └── unescaped: "\n(?:[\#$%_']|\\(\\)|\\(,\\)|\\[\\]|[0-9])*\n  (?:[\#$%_']+)\n"
         ├── @ CallNode (location: (26,0)-(26,16))
         │   ├── flags: ∅
         │   ├── receiver: