gn format: add call wrapping

tools/gn/format_test_data/017.golden

-executable(
-  "win"  # Suffix comment on arg.
+executable("win"  # Suffix comment on arg.
 
-  # And a strangely positioned line comment for some reason
-) {
+           # And a strangely positioned line comment for some reason
+           ) {
   defines = []  # Defines comment, suffix at end position.
 
   deps = [
     # Deps comment, should be forced multiline.
   ]
 
   sources = [
     "a.cc",
 
     # End of single sources comment, should be forced multiline.
   ]
 
   # End of block comment.
 }