htop: fix configure.am error with --enable-sensors

Commit 23c81659b5de67f4cf032e31c024a8b1a283fc45 didn't get the configure flag quite right. According to https://github.com/htop-dev/htop/blob/main/configure.ac#L671, it's `--enable-sensors`, not `--with-sensors`.

I tested this out locally with

```
programs.htop = {
enable = true;
package = pkgs.htop.overrideAttrs (prev: {
configureFlags = [
"--enable-unicode"
"--sysconfdir=/etc"
"--enable-affinity"
"--enable-capabilities"
"--enable-delayacct"
"--enable-sensors"
];
});
};
```

pkgs/tools/system/htop/default.nix

···
       "--enable-capabilities"
       "--enable-delayacct"
     ]
-    ++ lib.optional sensorsSupport "--with-sensors"
+    ++ lib.optional sensorsSupport "--enable-sensors"
   ;
 
   postFixup =