ScalafmtConfig: no dangling parens for scala.js

That style uses either config style (which preserves or forces dangling
regardless of the setting) or binpacking without dangling. Currently,
binpacking ignores the dangling setting but is about to use it.

scalafmt-core/shared/src/main/scala/org/scalafmt/config/ScalafmtConfig.scala

@@ -284,6 +284,7 @@ object ScalafmtConfig {
       unsafeCallSite = BinPack.Unsafe.Always,
       parentConstructors = BinPack.ParentCtors.Always
     ),
+    danglingParentheses = DanglingParentheses(false, false),
     indent = Indents(callSite = 4, defnSite = 4),
     importSelectors = ImportSelectors.binPack,
     newlines = default.newlines.copy(