Fix `OS.get_system_font_path` and `OS.get_system_font_path_for_text` to return correct value

platform/windows/os_windows.cpp

@@ -1183,7 +1183,7 @@ Vector<String> OS_Windows::get_system_font_path_for_text(const String &p_font_na
 		if (FAILED(hr)) {
 			continue;
 		}
-		String fpath = String::utf16((const char16_t *)&file_path[0]);
+		String fpath = String::utf16((const char16_t *)&file_path[0]).replace("\\", "/");
 
 		WIN32_FIND_DATAW d;
 		HANDLE fnd = FindFirstFileW((LPCWSTR)&file_path[0], &d);
@@ -1262,7 +1262,7 @@ String OS_Windows::get_system_font_path(const String &p_font_name, int p_weight,
 		if (FAILED(hr)) {
 			continue;
 		}
-		String fpath = String::utf16((const char16_t *)&file_path[0]);
+		String fpath = String::utf16((const char16_t *)&file_path[0]).replace("\\", "/");
 
 		WIN32_FIND_DATAW d;
 		HANDLE fnd = FindFirstFileW((LPCWSTR)&file_path[0], &d);