lib.ec.ssh.Exec: Drop askpass newline

__init_askpass() generates an askpass script whose echo statement
embeds a newline inside the quoted password: echo -n "PASSWORD
". Bash happily spans the quote over the newline, and the script
therefore prints the password followed by a trailing newline.
run_askpass() returns that output verbatim, so the password passed
on carries a newline and authentication fails.

Write the script so it prints the password and nothing else.

Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v0.84.2
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/ec/ssh/Exec.py

@@ -39,7 +39,7 @@ class Exec(Base):
             )
             os.chmod(f.name, 0o0700)
             self.__askpass = f.name
-            f.write(f'#!/bin/bash\n\necho -n "{self.password}\n"')
+            f.write(f'#!/bin/bash\n\necho -n "{self.password}"\n')
             f.close()
             for key, val in {
                 'SSH_ASKPASS': self.__askpass,