TextEditor: Open files with ReadOnly when we're just reading them

Userland/Applications/TextEditor/MainWidget.cpp

@@ -260,7 +260,7 @@ MainWidget::MainWidget()
     });
 
     m_open_action = GUI::CommonActions::make_open_action([this](auto&) {
-        auto fd_response = m_file_system_access_client->prompt_open_file(Core::StandardPaths::home_directory(), Core::OpenMode::ReadWrite);
+        auto fd_response = m_file_system_access_client->prompt_open_file(Core::StandardPaths::home_directory(), Core::OpenMode::ReadOnly);
 
         if (fd_response.error() != 0) {
             if (fd_response.error() != -1)

Userland/Applications/TextEditor/main.cpp

@@ -107,7 +107,7 @@ int main(int argc, char** argv)
     if (file_to_edit) {
         // A file name was passed, parse any possible line and column numbers included.
         FileArgument parsed_argument(file_to_edit);
-        auto file = Core::File::open(file_to_edit_full_path, Core::OpenMode::ReadWrite);
+        auto file = Core::File::open(file_to_edit_full_path, Core::OpenMode::ReadOnly);
 
         if (file.is_error())
             return 1;