[clang-format] Fix AllowAllConstructorInitializersOnNextLine value

The default value of the now deprecated
AllowAllConstructorInitializersOnNextLine was always true
regardless of the value of BasedOnStyle. This patch fixes the typo
in the code that handles the related backward compatibility.

clang/lib/Format/Format.cpp

@@ -664,7 +664,7 @@ template <> struct MappingTraits<FormatStyle> {
     const bool IsGoogleOrChromium = BasedOn.equals_insensitive("google") ||
                                     BasedOn.equals_insensitive("chromium");
     bool OnCurrentLine = IsGoogleOrChromium;
-    bool OnNextLine = IsGoogleOrChromium;
+    bool OnNextLine = true;
     IO.mapOptional("ConstructorInitializerAllOnOneLineOrOnePerLine",
                    OnCurrentLine);
     IO.mapOptional("AllowAllConstructorInitializersOnNextLine", OnNextLine);