Fix SourceBranch -> SourceBranchName in git clone for Web UI

.ci/azure-pipelines.yml

@@ -34,7 +34,7 @@ jobs:
       displayName: "Check out web"
       condition: and(succeeded(), or(contains(variables['Build.SourceBranch'], 'release'), contains(variables['Build.SourceBranch'], 'master')) ,eq(variables['BuildConfiguration'], 'Release'), in(variables['Build.Reason'], 'IndividualCI', 'BatchedCI', 'BuildCompletion'))
       inputs:
-        script: 'git clone --single-branch --branch $(Build.SourceBranch) --depth=1 https://github.com/jellyfin/jellyfin-web.git $(Agent.TempDirectory)/jellyfin-web'
+        script: 'git clone --single-branch --branch $(Build.SourceBranchName) --depth=1 https://github.com/jellyfin/jellyfin-web.git $(Agent.TempDirectory)/jellyfin-web'
 
     - task: CmdLine@2
       displayName: "Check out web (PR)"
@@ -203,7 +203,7 @@ jobs:
       displayName: "Check out web"
       condition: and(succeeded(), or(contains(variables['Build.SourceBranch'], 'release'), contains(variables['Build.SourceBranch'], 'master')) ,eq(variables['BuildConfiguration'], 'Release'), in(variables['Build.Reason'], 'IndividualCI', 'BatchedCI', 'BuildCompletion'))
       inputs:
-        script: 'git clone --single-branch --branch $(Build.SourceBranch) --depth=1 https://github.com/jellyfin/jellyfin-web.git $(Agent.TempDirectory)/jellyfin-web'
+        script: 'git clone --single-branch --branch $(Build.SourceBranchName) --depth=1 https://github.com/jellyfin/jellyfin-web.git $(Agent.TempDirectory)/jellyfin-web'
 
     - task: CmdLine@2
       displayName: "Check out web (PR)"