Settings: more specific read and write mode

For each filesystem interaction be more specific if we want to read from
the file or write to it.

Doing a non-creating read on the loading of the settings file, otherwise
an empty file could be created, and when reading that empty file for the
initial settings I would expect an error (or random data) when reading.

Author: NeroBurner

src/components/settings/Settings.cpp

@@ -26,7 +26,7 @@ void Settings::LoadSettingsFromFile() {
   SettingsData bufferSettings;
   lfs_file_t settingsFile;
 
-  if ( fs.FileOpen(&settingsFile, "/settings.dat", LFS_O_RDWR | LFS_O_CREAT) != LFS_ERR_OK) {
+  if ( fs.FileOpen(&settingsFile, "/settings.dat", LFS_O_RDONLY) != LFS_ERR_OK) {
     return;
   }
   fs.FileRead(&settingsFile, reinterpret_cast<uint8_t*>(&bufferSettings), sizeof(settings));
@@ -39,7 +39,7 @@ void Settings::LoadSettingsFromFile() {
 void Settings::SaveSettingsToFile() {
   lfs_file_t settingsFile;
 
-  if ( fs.FileOpen(&settingsFile, "/settings.dat", LFS_O_RDWR | LFS_O_CREAT) != LFS_ERR_OK) {
+  if ( fs.FileOpen(&settingsFile, "/settings.dat", LFS_O_WRONLY | LFS_O_CREAT) != LFS_ERR_OK) {
     return;
   }
   fs.FileWrite(&settingsFile, reinterpret_cast<uint8_t*>(&settings), sizeof(settings));