Fix brightness and screenshot shortcuts in MainUI (#1616)

Fix regression bug in `keymon` causing brightness and screenshot to not
work in MainUI.

Fixes #1613

Makefile

@@ -1,7 +1,7 @@
 ###########################################################
 
 TARGET=Onion
-VERSION=4.3.1
+VERSION=4.3.1-1
 RA_SUBVERSION=1.15.0.13
 
 ###########################################################

src/keymon/keymon.c

@@ -1,7 +1,6 @@
 #include <dirent.h>
 #include <fcntl.h>
 #include <poll.h>
-#include <pthread.h>
 #include <signal.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ -58,7 +57,6 @@ void takeScreenshot(void)
 {
     super_short_pulse();
     display_setBrightnessRaw(0);
-    display_reset();
     msleep(10);
     osd_hideBar();
     screenshot_recent();
@@ -337,16 +335,6 @@ void turnOffScreen(void)
     suspend_exec(stay_awake ? -1 : timeout);
 }
 
-static void *runWritingSettingsThread(void *param)
-{
-    bool *isWritingSettingsThreadActive = (bool *)param;
-    *isWritingSettingsThreadActive = true;
-    settings_shm_write();
-    settings_save();
-    *isWritingSettingsThreadActive = false;
-    return 0;
-}
-
 //
 //    Main
 //
@@ -410,9 +398,8 @@ int main(void)
     bool delete_flag = false;
     bool settings_changed = false;
 
+    int save_settings_timestamp = 0;
     volatile bool needWriteSettings = false;
-    volatile bool isWritingSettingsThreadActive = false;
-    pthread_t writingSettingsThread;
 
     time_t fav_last_modified = time(NULL);
 
@@ -764,12 +751,15 @@ int main(void)
             else if (volDown_state == RELEASED && volUp_state == RELEASED)
                 comboKey_volume = false;
 
-            if (settings_changed || needWriteSettings) {
+            if (settings_changed) {
+                settings_shm_write();
                 needWriteSettings = true;
-                if (!isWritingSettingsThreadActive) {
-                    needWriteSettings = false;
-                    pthread_create(&writingSettingsThread, NULL, runWritingSettingsThread, &isWritingSettingsThreadActive);
-                }
+                save_settings_timestamp = ticks;
+            }
+
+            if (needWriteSettings && (ticks - save_settings_timestamp) > 150) {
+                settings_save();
+                needWriteSettings = false;
             }
 
             if ((val == PRESSED) && (system_state == MODE_MAIN_UI)) {