ICU-22977 Revert temp fix for MSVC builds, SkipUWP

This reverts commit 743998dfaf93a534dec60de159f2dbdd69324386.

.github/workflows/icu4c.yml

diff --git a/.github/workflows/icu4c.yml b/.github/workflows/icu4c.yml
index 0dcb475..9909375 100644
--- a/.github/workflows/icu4c.yml
+++ b/.github/workflows/icu4c.yml
@@ -383,10 +383,10 @@
         uses: microsoft/setup-msbuild@v2
       - name: Build Solution x64
         if: contains(matrix.test_flags, 'arm Release')
-        run: msbuild icu4c/source/allinone/allinone.sln /p:Configuration=Release /p:Platform=x64 /p:SkipUWP=true
+        run: msbuild icu4c/source/allinone/allinone.sln /p:Configuration=Release /p:Platform=x64
       - name: Build Solution
         run: |
-          msbuild icu4c/source/allinone/allinone.sln ${{ matrix.build_flags }} /p:SkipUWP=true
+          msbuild icu4c/source/allinone/allinone.sln ${{ matrix.build_flags }}
       - name: Run ${{ matrix.test_flags }} Tests (icucheck.bat)
         if: contains(matrix.test_flags, 'arm Release') == false
         run: |
@@ -433,9 +433,9 @@
       uses: microsoft/setup-msbuild@v2
     - name: Build Solution x64
       if: contains(matrix.win_ver, 'ARM64')
-      run: msbuild icu4c/source/allinone/allinone.sln /p:Configuration=Release /p:Platform=x64 /p:SkipUWP=true
+      run: msbuild icu4c/source/allinone/allinone.sln /p:Configuration=Release /p:Platform=x64
     - name: Build Solution
-      run: msbuild icu4c/source/allinone/allinone.sln /p:Configuration=Release /p:Platform=${{ matrix.plat }} /p:SkipUWP=true
+      run: msbuild icu4c/source/allinone/allinone.sln /p:Configuration=Release /p:Platform=${{ matrix.plat }}
     - name: Run Tests (icucheck.bat)
       if: contains(matrix.win_ver, 'ARM64') == false
       run: icu4c/source/allinone/icucheck.bat ${{ matrix.arch }} Release

.github/workflows/icu_merge_ci.yml

diff --git a/.github/workflows/icu_merge_ci.yml b/.github/workflows/icu_merge_ci.yml
index 51d264e..9abc763 100644
--- a/.github/workflows/icu_merge_ci.yml
+++ b/.github/workflows/icu_merge_ci.yml
@@ -843,11 +843,11 @@
       - name: Set up MSBuild
         uses: microsoft/setup-msbuild@v2
       - name: Build Solution
-        run: msbuild icu4c/source/allinone/allinone.sln /p:Configuration=${{ matrix.config }} /p:Platform=${{ matrix.platform }} /p:SkipUWP=true
+        run: msbuild icu4c/source/allinone/allinone.sln /p:Configuration=${{ matrix.config }} /p:Platform=${{ matrix.platform }}
       - name: Run Tests (icucheck.bat)
         run: icu4c/source/allinone/icucheck.bat ${{ matrix.arch }} ${{ matrix.config }}
       - name: Build Sample Solution
-        run: msbuild icu4c/source/samples/all/all.sln /p:Configuration=${{ matrix.config }} /p:Platform=${{ matrix.arch }} /p:SkipUWP=true
+        run: msbuild icu4c/source/samples/all/all.sln /p:Configuration=${{ matrix.config }} /p:Platform=${{ matrix.arch }}
       - name: Test Samples (samplecheck.bat)
         run: icu4c/source/samples/all/samplecheck.bat ${{ matrix.arch }} ${{ matrix.config }}