modify loongson workflow

Author: fengyuentau

.github/workflows/OCV-PR-4.x-loongnix-loongarch64.yaml

@@ -21,7 +21,7 @@ env:
   ANT_HOME: '/usr/share/ant'
   PYTHONPATH: '${{ github.workspace }}/build/python_loader:$PYTHONPATH'
   OPENCV_TEST_DATA_PATH: '${{ github.workspace }}/opencv_extra/testdata'
-  # GTEST_FILTER_STRING: '-GOTURN.memory_usage:DaSiamRPN.memory_usage:videoio_dynamic.basic_write:videoio/videocapture_acceleration.read/64:videoio/videocapture_acceleration.read/65:videoio/videocapture_acceleration.read/66:videoio/videocapture_acceleration.read/67'
+  # GTEST_FILTER_STRING: ''
 
 jobs:
   BuildAndTest: