Preserve user indentation in go2rtc source override YAML

Stop stripping leading whitespace from override lines so that nested
YAML (e.g. list items with indented subkeys) is preserved correctly.
Base indentation (4 spaces) is still prepended to every line.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: matteius

src/video/go2rtc/go2rtc_process.c

@@ -716,18 +716,13 @@ bool go2rtc_process_generate_config(const char *config_path, int api_port) {
             // Quote stream name for YAML safety (handles spaces, colons, etc.)
             fprintf(config_file, "  \"%s\":\n", streams[i].name);
 
-            // Write each line of the override with proper indentation
+            // Write each line of the override with base indentation while
+            // preserving any user-provided indentation within the YAML.
             const char *p = streams[i].go2rtc_source_override;
             while (*p) {
-                // Skip leading whitespace on each line
-                while (*p == ' ' || *p == '\t') p++;
-                if (*p == '\0') break;
-
                 const char *eol = strchr(p, '\n');
                 if (eol) {
-                    if (eol > p) { // skip empty lines
-                        fprintf(config_file, "    %.*s\n", (int)(eol - p), p);
-                    }
+                    fprintf(config_file, "    %.*s\n", (int)(eol - p), p);
                     p = eol + 1;
                 } else {
                     fprintf(config_file, "    %s\n", p);