fix(install): use correct arch name in 32-bit test (starship#2234)

Author: davidkna

install/install.sh

@@ -202,7 +202,7 @@ detect_arch() {
   esac
 
   # `uname -m` in some cases mis-reports 32-bit OS as 64-bit, so double check
-  if [ "${arch}" = "x64" ] && [ "$(getconf LONG_BIT)" -eq 32 ]; then
+  if [ "${arch}" = "x86_64" ] && [ "$(getconf LONG_BIT)" -eq 32 ]; then
     arch=i686
   elif [ "${arch}" = "aarch64" ] && [ "$(getconf LONG_BIT)" -eq 32 ]; then
     arch=arm