obs-scripting: Fix Python version detection on Windows

Prior code would not only iterate over possible versioned python DLL
names, but also replace possible named subdirectories contained in the
path string.

This commit changes the same code to only change the filename and leave
the path prefix intact.

deps/obs-scripting/obs-scripting-python-import.c

@@ -63,21 +63,22 @@ bool import_python(const char *python_path, python_version_t *python_version)
 	}
 
 	struct dstr lib_candidate_path;
-	dstr_init_copy(&lib_candidate_path, lib_path.array);
+	dstr_init(&lib_candidate_path);
 
 	char cur_version[5];
 	char next_version[5];
 
-	char temp[PATH_MAX];
-
 	snprintf(cur_version, sizeof(cur_version), VERSION_PATTERN,
 		 PY_MAJOR_VERSION_MAX, PY_MINOR_VERSION_MAX);
-	snprintf(temp, sizeof(temp), FILE_PATTERN, cur_version);
 
-	dstr_cat(&lib_candidate_path, temp);
+	struct dstr temp;
+	dstr_init(&temp);
+	dstr_printf(&temp, FILE_PATTERN, cur_version);
 
 	int minor_version = PY_MINOR_VERSION_MAX;
 	do {
+		dstr_printf(&lib_candidate_path, "%s%s", lib_path.array,
+			    temp.array);
 		if (access(lib_candidate_path.array, F_OK) == 0) {
 			lib = os_dlopen(lib_candidate_path.array);
 		}
@@ -90,9 +91,10 @@ bool import_python(const char *python_path, python_version_t *python_version)
 			 PY_MAJOR_VERSION_MAX, minor_version);
 		snprintf(next_version, sizeof(next_version), VERSION_PATTERN,
 			 PY_MAJOR_VERSION_MAX, --minor_version);
-		dstr_replace(&lib_candidate_path, cur_version, next_version);
+		dstr_replace(&temp, cur_version, next_version);
 	} while (minor_version > 5);
 
+	dstr_free(&temp);
 	dstr_free(&lib_candidate_path);
 
 	if (!lib) {