Stop using the host python3

We've now got a prebuilt in prebuilts/build-tools

Bug: 123089883
Test: treehugger
Change-Id: Ic0fb09c8970f3a1c9f3b7b0303168520dcbfc3d8
Merged-In: Ic0fb09c8970f3a1c9f3b7b0303168520dcbfc3d8
(cherry picked from commit 669f769470)

ui/build/paths/config.go

@@ -74,28 +74,27 @@ func GetConfig(name string) PathConfig {
 }
 
 var Configuration = map[string]PathConfig{
-	"bash":     Allowed,
-	"dd":       Allowed,
-	"diff":     Allowed,
-	"dlv":      Allowed,
-	"expr":     Allowed,
-	"fuser":    Allowed,
-	"getopt":   Allowed,
-	"git":      Allowed,
-	"hexdump":  Allowed,
-	"jar":      Allowed,
-	"java":     Allowed,
-	"javap":    Allowed,
-	"lsof":     Allowed,
-	"openssl":  Allowed,
-	"patch":    Allowed,
-	"pstree":   Allowed,
-	"python3":  Allowed,
-	"rsync":    Allowed,
-	"sh":       Allowed,
-	"tr":       Allowed,
-	"unzip":    Allowed,
-	"zip":      Allowed,
+	"bash":    Allowed,
+	"dd":      Allowed,
+	"diff":    Allowed,
+	"dlv":     Allowed,
+	"expr":    Allowed,
+	"fuser":   Allowed,
+	"getopt":  Allowed,
+	"git":     Allowed,
+	"hexdump": Allowed,
+	"jar":     Allowed,
+	"java":    Allowed,
+	"javap":   Allowed,
+	"lsof":    Allowed,
+	"openssl": Allowed,
+	"patch":   Allowed,
+	"pstree":  Allowed,
+	"rsync":   Allowed,
+	"sh":      Allowed,
+	"tr":      Allowed,
+	"unzip":   Allowed,
+	"zip":     Allowed,
 
 	// Host toolchain is removed. In-tree toolchain should be used instead.
 	// GCC also can't find cc1 with this implementation.