removal of x86_64

Author: sireeshajonnalagadda

src/powershell/install.sh

@@ -296,10 +296,9 @@ install_using_github() {
     if ! type git > /dev/null 2>&1; then
         check_packages git
     fi
-    if [ "${architecture}" = "x86_64" ]; then
-        architecture="amd64"
-        else
-        architecture="x64"   
+
+     if [ "${architecture}" = "amd64" ]; then
+        architecture="x64"
     fi
     pwsh_url="https://github.com/PowerShell/PowerShell"
     find_version_from_git_tags POWERSHELL_VERSION $pwsh_url