Regenerate line break hints after newline

Fixes #486.

src/dfmt/formatter.d

@@ -1406,7 +1406,7 @@ private:
             {
                 pushWrapIndent();
                 newline();
-                if (ufcsWrap)
+                if (ufcsWrap || onNextLine)
                     regenLineBreakHints(index);
             }
             writeToken();

tests/allman/issue0486.d.ref

@@ -0,0 +1,5 @@
+void main()
+{
+    auto someAutoVariableName = this.firstLink.secondLink
+        .filter!(shouldBeProbablySomeIdentifierOrNot);
+}

tests/issue0486.args

@@ -0,0 +1 @@
+--keep_line_breaks=true

tests/issue0486.d

@@ -0,0 +1,5 @@
+void main()
+{
+    auto someAutoVariableName = this.firstLink.secondLink
+        .filter!(shouldBeProbablySomeIdentifierOrNot);
+}

tests/otbs/issue0486.d.ref

@@ -0,0 +1,4 @@
+void main() {
+    auto someAutoVariableName = this.firstLink.secondLink
+        .filter!(shouldBeProbablySomeIdentifierOrNot);
+}