Fix various typos

Found via `codespell -q 3 -S ./src/libs -L ans,doubleclick,trough`

src/displayapp/LittleVgl.cpp

@@ -94,8 +94,8 @@ void LittleVgl::FlushDisplay(const lv_area_t* area, lv_color_t* color_p) {
   uint16_t y1, y2, width, height = 0;
 
   ulTaskNotifyTake(pdTRUE, 200);
-  // NOtification is still needed (even if there is a mutex on SPI) because of the DataCommand pin
-  // which cannot be set/clear during a transfert.
+  // Notification is still needed (even if there is a mutex on SPI) because of the DataCommand pin
+  // which cannot be set/clear during a transfer.
 
   if ((scrollDirection == LittleVgl::FullRefreshDirections::Down) && (area->y2 == visibleNbLines - 1)) {
     writeOffset = ((writeOffset + totalNbLines) - visibleNbLines) % totalNbLines;

src/displayapp/fonts/generate.py

@@ -43,7 +43,7 @@ def main():
     if not os.path.exists(args.config):
         sys.exit(f'Error: the config file {args.config} does not exist.')
     if not os.access(args.config, os.R_OK):
-        sys.exit(f'Error: the config file {args.config} is not accessable (permissions?).')
+        sys.exit(f'Error: the config file {args.config} is not accessible (permissions?).')
     with open(args.config, 'r') as fd:
         data = json.load(fd)
 

src/displayapp/screens/Screen.h

@@ -35,7 +35,7 @@ namespace Pinetime {
 
       private:
         T value {};            // NSDMI - default initialise type
-        bool isUpdated {true}; // NSDMI - use brace initilisation
+        bool isUpdated {true}; // NSDMI - use brace initialisation
       };
 
       class Screen {