Change "COMPANY_NAME" to "PACKAGER_NAME"

The COMPANY_NAME currently sets the "CompanyName" field in the metadata
of Windows binaries. Our intent of this field is this field to contain
information about the company/party that produced the binary.

Also from [FileVersionInfo.CompanyName][FileVersionInfo.CompanyName]:

> Gets the name of the company that produced the file

Based on the above, "PACKAGER_NAME" is a bit more generic, and clearer
on intent, and we may at some point re-use this same information to
propagate equivalent fields on other platforms (rpms, debs)

[FileVersionInfo.CompanyName]: https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.fileversioninfo.companyname

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

scripts/build/mkversioninfo

@@ -1,7 +1,7 @@
 #!/usr/bin/env sh
 set -eu
 
-: "${COMPANY_NAME=}"
+: "${PACKAGER_NAME=}"
 
 . ./scripts/build/.variables
 
@@ -31,7 +31,7 @@ cat > ./cli/winresources/versioninfo.json <<EOL
   "StringFileInfo":
   {
     "Comments": "",
-    "CompanyName": "${COMPANY_NAME}",
+    "CompanyName": "${PACKAGER_NAME}",
     "FileDescription": "Docker Client",
     "FileVersion": "${VERSION}",
     "InternalName": "",