Revert "contrib: Fix capture_output in getcoins.py"

This reverts commit be59bd1
because the changes are no longer needed.

Author: MarcoFalke

contrib/signet/getcoins.py

@@ -129,7 +129,7 @@ def bitcoin_cli(rpc_command_and_params):
 
     # Convert SVG image to PPM, and load it
     try:
-        rv = subprocess.run([args.imagemagick, 'svg:-', '-depth', '8', 'ppm:-'], input=res.content, check=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        rv = subprocess.run([args.imagemagick, 'svg:-', '-depth', '8', 'ppm:-'], input=res.content, check=True, capture_output=True)
     except FileNotFoundError:
         raise SystemExit(f"The binary {args.imagemagick} could not be found. Please make sure ImageMagick (or a compatible fork) is installed and that the correct path is specified.")