[buildbot] phase1: Git() no need to specify branch

[LEDE Commits]

ynezz pushed a commit to buildbot.git, branch master:
https://git.openwrt.org/4228b8c195132d08eeba3e3bd9f6e34f42420c85

commit 4228b8c195132d08eeba3e3bd9f6e34f42420c85
Author: Thibaut VARÈNE <hacks at slashdirt.org>
AuthorDate: Fri Oct 21 18:38:58 2022 +0200

    phase1: Git() no need to specify branch
    
    Signed-off-by: Thibaut VARÈNE <hacks at slashdirt.org>
---
 phase1/master.cfg | 1 -
 1 file changed, 1 deletion(-)

diff --git a/phase1/master.cfg b/phase1/master.cfg
index a1c55db..c6edad3 100644
--- a/phase1/master.cfg
+++ b/phase1/master.cfg
@@ -565,7 +565,6 @@ for target in targets:
 	factory.addStep(Git(
 		name = "git",
 		repourl = repo_url,
-		branch = Interpolate("%(prop:branch)s"),
 		mode = 'full',
 		method = 'fresh',
 		locks = NetLockDl,