Userland: static vs non-static constexpr variables

Problem:
- `static` variables consume memory and sometimes are less
  optimizable.
- `static const` variables can be `constexpr`, usually.
- `static` function-local variables require an initialization check
  every time the function is run.

Solution:
- If a global `static` variable is only used in a single function then
  move it into the function and make it non-`static` and `constexpr`.
- Make all global `static` variables `constexpr` instead of `const`.
- Change function-local `static const[expr]` variables to be just
  `constexpr`.

Userland/Applications/HexEditor/FindDialog.cpp

@@ -5,9 +5,9 @@
  */
 
 #include "FindDialog.h"
+#include <AK/Array.h>
 #include <AK/Hex.h>
 #include <AK/String.h>
-#include <AK/Vector.h>
 #include <LibGUI/BoxLayout.h>
 #include <LibGUI/Button.h>
 #include <LibGUI/Label.h>
@@ -19,17 +19,12 @@
 #include <LibGfx/FontDatabase.h>
 
 struct Option {
-    String title;
+    StringView title;
     OptionId opt;
     bool enabled;
     bool default_action;
 };
 
-static const Vector<Option> options = {
-    { "ACII String", OPTION_ASCII_STRING, true, true },
-    { "Hex value", OPTION_HEX_VALUE, true, false },
-};
-
 int FindDialog::show(GUI::Window* parent_window, String& out_text, ByteBuffer& out_buffer)
 {
     auto dialog = FindDialog::construct();
@@ -88,6 +83,11 @@ Result<ByteBuffer, String> FindDialog::process_input(String text_value, OptionId
 FindDialog::FindDialog()
     : Dialog(nullptr)
 {
+    constexpr Array options = {
+        Option { "ACII String", OPTION_ASCII_STRING, true, true },
+        Option { "Hex value", OPTION_HEX_VALUE, true, false },
+    };
+
     resize(280, 180 + ((static_cast<int>(options.size()) - 3) * 16));
     center_on_screen();
     set_resizable(false);
@@ -113,7 +113,7 @@ FindDialog::FindDialog()
         radio.set_enabled(action.enabled);
         radio.set_text(action.title);
 
-        radio.on_checked = [this, i](auto) {
+        radio.on_checked = [&](auto) {
             m_selected_option = options[i].opt;
         };