flash_loader: fix typo in the stm32l4 loader

flashloaders/stm32l4.s

@@ -12,7 +12,7 @@
     .global copy
 copy:
     ldr r12, flash_base
-    ldr r10, flash_off_bsy
+    ldr r10, flash_off_sr
     add r10, r10, r12
 
 loop:
@@ -44,5 +44,5 @@ exit:
     .align 2
 flash_base:
     .word 0x40022000
-flash_off_bsy:
-    .word 0x12
+flash_off_sr:
+    .word 0x10

src/stlink-lib/flash_loader.c

@@ -114,7 +114,7 @@ static const uint8_t loader_code_stm32l4[] = {
     0x08, 0x3a, 0xf0, 0xdc,
     0x00, 0xbe, 0x00, 0xbf,
     0x00, 0x20, 0x02, 0x40,
-    0x12, 0x00, 0x00, 0x00
+    0x10, 0x00, 0x00, 0x00
 };
 
 static const uint8_t loader_code_stm32f7[] = {