Misc Windows CI updates

* Bump Erlang version
* Small formatting changes

Follow-up to #276

Use `(Get-ItemProperty -Name Install_Dir -Path 'HKLM:\SOFTWARE\WOW6432Node\VMware, Inc.\RabbitMQ Server').Install_Dir` to get the RabbitMQ install dir.

.ci/install.ps1

@@ -10,7 +10,6 @@ Write-Host "[INFO] versions: $versions"
 $erlang_ver = $versions.erlang
 $rabbitmq_ver = $versions.rabbitmq
 
-
 $base_installers_dir = Join-Path -Path $HOME -ChildPath 'installers'
 if (-Not (Test-Path $base_installers_dir))
 {
@@ -88,25 +87,16 @@ Write-Host '[INFO] Installing and starting RabbitMQ with default config...'
 & $rabbitmq_installer_path '/S' | Out-Null
 (Get-Service -Name RabbitMQ).Status
 
+$rabbitmq_base_path = (Get-ItemProperty -Name Install_Dir -Path 'HKLM:\SOFTWARE\WOW6432Node\VMware, Inc.\RabbitMQ Server').Install_Dir
 $regPath = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\RabbitMQ'
 if (Test-Path 'HKLM:\SOFTWARE\WOW6432Node\')
 {
     $regPath = 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\RabbitMQ'
 }
-$rabbitmq_base_path = Split-Path -Parent (Get-ItemProperty $regPath 'UninstallString').UninstallString
-$rabbitmq_version = (Get-ItemProperty $regPath "DisplayVersion").DisplayVersion
-
-
-
-Write-Host "[INFO] RabbitMQ version path: $rabbitmq_base_path  and version: $rabbitmq_version"
-
-## we have to remove the double quote added here
-## https://github.com/rabbitmq/rabbitmq-packaging/commit/4476a3489f80658b31c0b58a6a04314c9d7acf72
-$rabbitmq_base_path = $rabbitmq_base_path -replace '"', ''
+$rabbitmq_version = (Get-ItemProperty $regPath 'DisplayVersion').DisplayVersion
+Write-Host "[INFO] RabbitMQ version path: $rabbitmq_base_path and version: $rabbitmq_version"
 
 $rabbitmq_home = Join-Path -Path $rabbitmq_base_path -ChildPath "rabbitmq_server-$rabbitmq_version"
-
-
 Write-Host "[INFO] Setting RABBITMQ_HOME to '$rabbitmq_home'..."
 [Environment]::SetEnvironmentVariable('RABBITMQ_HOME', $rabbitmq_home, 'Machine')
 $env:RABBITMQ_HOME = $rabbitmq_home

.ci/versions.json

@@ -1,4 +1,4 @@
 {
-  "erlang": "25.3",
+  "erlang": "26.0.2",
   "rabbitmq": "3.13.0-beta.3"
 }