tlp: remove all /usr/ prefixes to fix install dirs

TLP v1.7.0 [changed][1] more directories to be prefixed under `/usr/`,
which we do not want (see also [this Nixpkgs issue][2]). We already were
removing these prefixes for some (but not all) paths. To reduce the
chances of breaking in the future (and clarify why these are being set),
replace all of them uniformly.

[1]: https://github.com/linrunner/TLP/commit/d0d1231960bb790d1efd39427ab299e57edeb069
[2]: https://github.com/NixOS/nixpkgs/issues/349759

pkgs/tools/misc/tlp/default.nix

@@ -39,6 +39,10 @@
     ./patches/0002-reintroduce-tlp-sleep-service.patch
   ];
 
+  postPatch = ''
+    substituteInPlace Makefile --replace-fail ' ?= /usr/' ' ?= /'
+  '';
+
   buildInputs = [ perl ];
   nativeBuildInputs = [ makeWrapper ];
 
@@ -55,16 +59,6 @@
     "TLP_WITH_SYSTEMD=1"
 
     "DESTDIR=${placeholder "out"}"
-    "TLP_BATD=/share/tlp/bat.d"
-    "TLP_BIN=/bin"
-    "TLP_CONFDEF=/share/tlp/defaults.conf"
-    "TLP_CONFREN=/share/tlp/rename.conf"
-    "TLP_FLIB=/share/tlp/func.d"
-    "TLP_MAN=/share/man"
-    "TLP_META=/share/metainfo"
-    "TLP_SBIN=/sbin"
-    "TLP_SHCPL=/share/bash-completion/completions"
-    "TLP_TLIB=/share/tlp"
   ];
 
   installTargets = [ "install-tlp" "install-man" ]