metal : remove stray return

Author: ggerganov

ggml/src/ggml-metal/ggml-metal-device.m

@@ -703,7 +703,6 @@ bool ggml_metal_device_supports_op(ggml_metal_device_t dev, const struct ggml_te
         case GGML_OP_ARANGE:
             return true;
         case GGML_OP_FLASH_ATTN_EXT:
-        return false;
             // for new head sizes, add checks here
             if (op->src[0]->ne[0] != 32 &&
                 op->src[0]->ne[0] != 40 &&