[fix] use __file__ to calculate the pwb.py origin path

Bug: T321452
Change-Id: I238f143036e8698c71488236ee01418c0458377a
---
M pwb.py
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pwb.py b/pwb.py
index 5cf60f1..c01f42f 100755
--- a/pwb.py
+++ b/pwb.py
@@ -8,6 +8,7 @@
 #
 # Distributed under the terms of the MIT license.
 #
+import runpy
 import sys
 
 VERSIONS_REQUIRED_MESSAGE = """
@@ -29,9 +30,8 @@
 
 def main():
     """Entry point for :func:`tests.utils.execute_pwb`."""
-    import runpy
     from pathlib import Path
-    path = Path().resolve() / 'pywikibot' / 'scripts' / 'wrapper.py'
+    path = Path(__file__).parent / 'pywikibot' / 'scripts' / 'wrapper.py'
     runpy.run_path(str(path), run_name='__main__')
 
 

