Make sure WDT is re-enabled in eboot even in case of error (#517)

bootloaders/eboot/eboot.c

@@ -90,8 +90,6 @@ int copy_raw(const uint32_t src_addr,
     uint32_t saddr = src_addr;
     uint32_t daddr = dst_addr;
 
-    ets_wdt_disable();
-
     while (left) {
         if (SPIEraseSector(daddr/buffer_size)) {
             return 2;
@@ -107,8 +105,6 @@ int copy_raw(const uint32_t src_addr,
         left  -= buffer_size;
     }
 
-    ets_wdt_enable();
-
     return 0;
 }
 
@@ -130,7 +126,9 @@ void main()
 
     if (cmd.action == ACTION_COPY_RAW) {
         ets_putc('c'); ets_putc('p'); ets_putc(':');
+        ets_wdt_disable();
         res = copy_raw(cmd.args[0], cmd.args[1], cmd.args[2]);
+        ets_wdt_enable();
         ets_putc('0'+res); ets_putc('\n');
         if (res == 0) {
             cmd.action = ACTION_LOAD_APP;