Use default python in PATH for circleci windows bot. NFC

We no longer need to set this special path or environment varaible.

`C:\Python312\python.exe` is already in the path by default.

.circleci/config.yml

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 59de9a0..54f05b2 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -138,22 +138,17 @@
       name: win/server-2019
       shell: bash.exe
     environment:
-      # We need python installed before we can test anytyhing.
-      # There seems to be undocument copy of python installed here. Hopefully
-      # if this disappears there will be another way of getting a re-installed
-      # version.
-      PYTHON_BIN: "C:\\Python27amd64"
       PYTHONUNBUFFERED: "1"
       EMSDK_NOTTY: "1"
     steps:
       - checkout
-      - run:
-          name: Add python to bash path
-          command: echo "export PATH=\"$PATH:/c/python27amd64/\"" >> $BASH_ENV
+      - run: where python
+
       - run:
           name: Install latest
           shell: cmd.exe
           command: test\test.bat
+
       - run:
           name: test.py
           command: |

test/test.bat

diff --git a/test/test.bat b/test/test.bat
index c39bb3c..acdf444 100755
--- a/test/test.bat
+++ b/test/test.bat
@@ -1,5 +1,4 @@
 :: equivalent of test.sh as windows bat file
-set PATH=%PATH%;%PYTHON_BIN%
 CALL emsdk install latest
 CALL emsdk activate latest
 CALL emsdk_env.bat