Remove pwsh packaging check (false-positive on win7)

Fixes #5

Windows 7 Powershell at least as of 6.1.7601 supports the tested
functionality, making the test useless for checking support. Removing
this check completely will rely more on the ability to set the bit as a
check for setting the bit; that's already acknowledged in the docs so 👍

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## Next (YYYY-MM-DD)
 
+- Stop checking powershell's `PackageManagement` capability as a Win10 check
+  ([#5](https://github.com/watchexec/clearscreen/issues/5)).
+
 ## v1.0.7 (2021-08-26)
 
 - Flush after E3 sequence in `Terminfo` ([#4](https://github.com/watchexec/clearscreen/issues/4)).

src/lib.rs

@@ -1107,10 +1107,6 @@ mod win {
 			return true;
 		}
 
-		if pwsh_package_management().unwrap_or(false) {
-			return true;
-		}
-
 		vt_attempt().unwrap_or(false)
 	}
 }