fix: correct syntax error in matrix.platform condition

Co-authored-by: castrojo <1264109+castrojo@users.noreply.github.com>

Author: Copilot

.github/workflows/reusable-build-iso-anaconda.yml

@@ -127,7 +127,7 @@ jobs:
             podman
 
       - name: Maximize build space (remove-software)
-        if: matrix. platform != 'arm64'
+        if: matrix.platform != 'arm64'
         uses: ublue-os/remove-unwanted-software@cc0becac701cf642c8f0a6613bbdaf5dc36b259e # v9
         with:
           remove-codeql: true