GHA CI: drop needless syntax

https://docs.github.com/en/actions/learn-github-actions/expressions#about-expressions
>When you use expressions in an if conditional, you may omit the
>expression syntax (${{ }}) because GitHub automatically evaluates the if conditional as an expression.

.github/workflows/ci_macos.yaml

@@ -84,7 +84,7 @@ jobs:
           sudo cmake --install build
 
       - name: Build qBittorrent (Qt5)
-        if: ${{ startsWith(matrix.qt_version, 5) }}
+        if: startsWith(matrix.qt_version, 5)
         run: |
           CXXFLAGS="$CXXFLAGS -Werror -Wno-error=deprecated-declarations" \
           LDFLAGS="$LDFLAGS -gz" \
@@ -103,7 +103,7 @@ jobs:
           cmake --build build --target check
 
       - name: Build qBittorrent (Qt6)
-        if: ${{ startsWith(matrix.qt_version, 6) }}
+        if: startsWith(matrix.qt_version, 6)
         run: |
           CXXFLAGS="$CXXFLAGS -Wno-gnu-zero-variadic-macro-arguments -Werror -Wno-error=deprecated-declarations" \
           LDFLAGS="$LDFLAGS -gz" \

.github/workflows/ci_ubuntu.yaml

@@ -75,7 +75,7 @@ jobs:
           languages: cpp
 
       - name: Build qBittorrent (Qt5)
-        if: ${{ startsWith(matrix.qt_version, 5) }}
+        if: startsWith(matrix.qt_version, 5)
         run: |
           CXXFLAGS="$CXXFLAGS -Werror -Wno-error=deprecated-declarations" \
           LDFLAGS="$LDFLAGS -gz" \
@@ -94,7 +94,7 @@ jobs:
           DESTDIR="qbittorrent" cmake --install build
 
       - name: Build qBittorrent (Qt6)
-        if: ${{ startsWith(matrix.qt_version, 6) }}
+        if: startsWith(matrix.qt_version, 6)
         run: |
           CXXFLAGS="$CXXFLAGS -Werror" \
           LDFLAGS="$LDFLAGS -gz" \