[git] Hotfix remote git mapping patch creation procedure
Will fix errors like:
1.505658243s Error: phase build on image one stage gitLatestPatch handler failed: error preparing stage gitLatestPatch: error creating patch ↵
1.505670515s between `07bd04e9e2ad4fb03136943a2bbcb8aa50ff7471` and `07bd04e9e2ad4fb03136943a2bbcb8aa50ff7471` commits: git diff error: exit ↵
1.505684042s status 128
1.505687944s unrecognized output:
1.505692711s fatal: bad object 07bd04e9e2ad4fb03136943a2bbcb8aa50ff7471