Fix --lock-video-orientation syntax

The argument for option --lock-video-orientation has been made optional
by 5af9d0ee0f.

With getopt_long(), contrary to mandatory arguments, optional arguments
must be given with a '=':

    --lock-video-orientation 2   # wrong, parse error
    --lock-video-orientation=2   # correct

README.md

@@ -215,10 +215,10 @@ To lock the orientation of the mirroring:
 
 ```bash
 scrcpy --lock-video-orientation     # initial (current) orientation
-scrcpy --lock-video-orientation 0   # natural orientation
-scrcpy --lock-video-orientation 1   # 90° counterclockwise
-scrcpy --lock-video-orientation 2   # 180°
-scrcpy --lock-video-orientation 3   # 90° clockwise
+scrcpy --lock-video-orientation=0   # natural orientation
+scrcpy --lock-video-orientation=1   # 90° counterclockwise
+scrcpy --lock-video-orientation=2   # 180°
+scrcpy --lock-video-orientation=3   # 90° clockwise
 ```
 
 This affects recording orientation.

app/tests/test_cli.c

@@ -51,7 +51,7 @@ static void test_options(void) {
         "--fullscreen",
         "--max-fps", "30",
         "--max-size", "1024",
-        "--lock-video-orientation", "2",
+        "--lock-video-orientation=2", // optional arguments require '='
         // "--no-control" is not compatible with "--turn-screen-off"
         // "--no-display" is not compatible with "--fulscreen"
         "--port", "1234:1236",