LibGUI: Convert INISyntaxHighlighter to east-const

Userland/Libraries/LibGUI/INISyntaxHighlighter.cpp

@@ -10,7 +10,7 @@
 
 namespace GUI {
 
-static Syntax::TextStyle style_for_token_type(const Gfx::Palette& palette, IniToken::Type type)
+static Syntax::TextStyle style_for_token_type(Gfx::Palette const& palette, IniToken::Type type)
 {
     switch (type) {
     case IniToken::Type::LeftBracket:
@@ -36,7 +36,7 @@ bool IniSyntaxHighlighter::is_identifier(u64 token) const
     return ini_token == GUI::IniToken::Type::Name;
 }
 
-void IniSyntaxHighlighter::rehighlight(const Palette& palette)
+void IniSyntaxHighlighter::rehighlight(Palette const& palette)
 {
     auto text = m_client->get_text();
     IniLexer lexer(text);

Userland/Libraries/LibGUI/INISyntaxHighlighter.h

@@ -18,7 +18,7 @@ public:
     virtual bool is_identifier(u64) const override;
 
     virtual Syntax::Language language() const override { return Syntax::Language::INI; }
-    virtual void rehighlight(const Palette&) override;
+    virtual void rehighlight(Palette const&) override;
 
 protected:
     virtual Vector<MatchingTokenPair> matching_token_pairs_impl() const override;