fix(32-wallclock-profiler): use absolute path to find tool paths (#186)

Problem:

`Path(__file__)` can be ".", in such case `self.oncpu_tool` is "oncputime", which can not be found by the shell.

Solution:

Translate `Path(__file__)` to absolute path.

Author: jiangyinzuo

src/32-wallclock-profiler/wallclock_profiler.py

@@ -32,7 +32,7 @@ def __init__(self, pid, duration=30, freq=49, min_block_us=1000):
         self.offcpu_error = None
 
         # Find tool paths
-        self.script_dir = Path(__file__).parent
+        self.script_dir = Path(__file__).absolute().parent
         self.oncpu_tool = self.script_dir / "oncputime"
         self.offcpu_tool = self.script_dir / "offcputime"
 
@@ -916,4 +916,4 @@ def main():
         sys.exit(1)
 
 if __name__ == "__main__":
-    main() 
+    main()